test: automated responsive-layout harness (closes #13)

Verifies the mobile layout from #5 with a real browser engine instead of
by hand on a phone. make frontend-viewport-test builds dist/, serves it
from the same digest-pinned nginx image and the same nginx.conf the
shipping container uses, and drives a digest-pinned headless Chrome
against it over CDP.

Viewport widths are derived from the app's own CSS rather than from a
list of phone models: the @media conditions in src/styles.css and any
Tailwind responsive prefixes in the markup are parsed, and each
breakpoint is tested one pixel below, exactly on, and one pixel above.
max-width: 768px matches at 768, and a generic 375px test sails past
that boundary entirely. Four anchor viewports are added with stated
reasons: a 320px floor, a desktop baseline, and two phone-landscape
sizes straddling the breakpoint.

Assertions are on computed layout, not screenshots: horizontal overflow,
elements past the viewport edge, clipped text (deliberate ellipsis
truncation excluded), 44x44 minimum tap targets, and genuine reflow of
the host rows checked on both flex-direction and geometry. Probing and
gateway detection are asserted to still run at narrow widths, since the
early-return mobile path rejected in #8 is what would silently regress.
Screenshots are written to tmp/viewport/ as artifacts alongside the
results, not as the evidence.

puppeteer-core rather than playwright: it is the one variant of either
that never downloads or bundles a browser, so the browser stays a
digest-pinned image and the npm side is pinned by yarn.lock integrity.

The browser container runs on an --internal docker network with no route
off the host; the harness answers the app's latency probes itself from a
fixed delay table so the rows render a realistic spread of value widths.

Kept out of make check: it needs Docker and takes minutes, where make
test has to stay under 20 seconds.

Every check guards its own presence, so none can pass against a page it
is not measuring. The tap-target check in particular would otherwise be
inert: an empty undersized set means both "all controls are big enough"
and "the selectors have gone stale", and the size comparison alone
cannot tell those apart. Each selector therefore declares the minimum
number of visible instances the page must contain, per selector rather
than in total, so one stale selector out of four fails rather than only
all four at once.

Layout expectation is likewise refused rather than guessed. A width is
narrow when a max-width block matches (desktop-first, what the app does
today) or, for a min-width-only mobile-first set, when it falls below
every breakpoint; a set mixing both cannot be resolved from the
conditions alone, because which block owns the reflow is a property of
the rules inside it, so the run fails with an explanation instead of
testing the right widths against the wrong expectation.

The harness was observed failing before being trusted, four times: a
planted 900px fixed-width element in a host row; the mobile reflow rule
neutered; the tap-target threshold lowered so nothing was undersized and
.pin-btn then renamed, which took the check from 8/8 green at every
touch viewport to failing at all six, naming the stale selector; and a
second media block added so the breakpoint set mixed max and min, which
aborted the run. All reverted.

Against the current layout it reports two real defects, filed as #42
(horizontal overflow at 320px) and #43 (tap targets below 44x44).

.dockerignore

@@ -1,5 +1,6 @@
 node_modules
 dist
+tmp
 .DS_Store
 *.log
 .claude

.gitea/workflows/check.yml

@@ -6,5 +6,5 @@ jobs:
         steps:
             # actions/checkout v4.2.2, 2026-02-22
             - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
-            - run: docker build .
+            - run: script/cibuild
             - run: docker build -f Dockerfile.backend .

.gitignore

@@ -1,4 +1,5 @@
 node_modules/
 dist/
+tmp/
 .DS_Store
 *.log

.prettierignore

@@ -1,5 +1,6 @@
 backend/
 dist/
 node_modules/
+tmp/
 yarn.lock
 .claude/

Dockerfile

@@ -3,9 +3,12 @@ FROM node@sha256:e4bf2a82ad0a4037d28035ae71529873c069b13eb0455466ae0bc13363826e3
 WORKDIR /app
 COPY package.json yarn.lock ./
 RUN yarn install --frozen-lockfile
-RUN apk add --no-cache git
+RUN apk add --no-cache git make
 COPY . .
-RUN yarn build
+# make check runs script/check (test + lint + fmt-check); its test step
+# is the production yarn build, so this both produces dist/ and gates the
+# image on lint/fmt-check/test regressions, not merely a broken build.
+RUN make check
 
 # nginx:stable-alpine as of 2026-02-22
 FROM nginx@sha256:15e96e59aa3b0aada3a121296e3bce117721f42d88f5f64217ef4b18f458c6ab

Makefile

@@ -1,21 +1,42 @@
-.PHONY: dev test lint fmt fmt-check check docker
+.PHONY: bootstrap setup dev test lint fmt fmt-check check \
+	frontend-viewport-test docker hooks
+
+# Standard targets are thin shims; the implementations live in script/
+# per the scripts-to-rule-them-all pattern (see the Entrypoints section
+# of README.md).
+
+bootstrap:
+	@script/bootstrap
+
+setup:
+	@script/setup
 
 dev:
 	yarn dev
 
 test:
-	timeout 30 yarn build
+	@script/test
 
 lint:
-	yarn prettier --check .
+	@script/lint
 
 fmt:
-	yarn prettier --write .
+	@script/fmt
 
 fmt-check:
-	yarn prettier --check .
+	@script/fmt-check
 
-check: test lint fmt-check
+check:
+	@script/check
+
+# Responsive-layout verification in a containerised browser. Kept out of
+# check: it needs Docker and takes minutes, where make test has to stay
+# under 20 seconds.
+frontend-viewport-test:
+	@script/frontend-viewport-test
 
 docker:
-	timeout 300 docker build -t netwatch .
+	@script/docker
+
+hooks:
+	@script/install-precommit

README.md

@@ -23,6 +23,43 @@ docker build -t netwatch .
 docker run -p 8080:8080 netwatch
 ```
 
+## Entrypoints
+
+This repository adheres to the
+[Scripts to Rule Them All](https://github.com/github/scripts-to-rule-them-all)
+standard: normalized scripts in `script/` are the entrypoints for the
+development workflow, and the Makefile targets are thin shims that call them. We
+provide:
+
+- `script/bootstrap` — install all dependencies (pinned node via nvm if needed,
+  yarn via corepack, `yarn install --frozen-lockfile`)
+- `script/setup` — make a fresh clone ready for development: bootstrap plus the
+  git pre-commit hook
+- `script/projectname` — print the project name (used for the Docker image tag)
+- `script/test` — run the production build as the test (no unit tests yet)
+- `script/lint` — run prettier in check mode
+- `script/fmt` — format all files (writes)
+- `script/fmt-check` — check formatting (read-only)
+- `script/check` — run test, lint, and fmt-check
+- `script/frontend-viewport-test` — responsive-layout verification of the built
+  frontend in a containerised headless Chrome (see
+  [test/viewport/README.md](test/viewport/README.md)). Not part of
+  `script/check`: it needs Docker and takes minutes.
+- `script/docker` — build the Docker image tagged via `script/projectname`
+- `script/cibuild` — CI entrypoint: plain `docker build .`
+- `script/precommit` — run by the git pre-commit hook; runs `script/check`
+- `script/install-precommit` — install the git pre-commit hook
+
+## Responsive layout
+
+The narrow-viewport layout lives in the `max-width: 768px` media block in
+`src/styles.css`. It is verified automatically by `make frontend-viewport-test`,
+which drives a digest-pinned headless Chrome against the built `dist/` and
+asserts on computed layout at widths derived from that CSS — one pixel either
+side of every breakpoint it declares, plus a 320px floor, a desktop baseline and
+two landscape sizes. See [test/viewport/README.md](test/viewport/README.md) for
+what it covers and what it genuinely cannot.
+
 ## Rationale
 
 When debugging network issues, it's useful to have a persistent at-a-glance view

REPO_POLICIES.md

@@ -1,108 +1,408 @@
-# Development Policies
+---
+title: Repository Policies
+last_modified: 2026-07-06
+---
 
-- Docker image references by tag are server-mutable, therefore using them is an
-  RCE vulnerability. All docker image references must use cryptographic hashes
-  to securely specify the exact image that is expected.
+This document covers repository structure, tooling, and workflow standards. Code
+style conventions are in separate documents:
 
-- Correspondingly, `go install` commands using things like '@latest' are also
-  dangerous RCE. Whenever writing scripts or tools, ALWAYS specify go install
-  targets using commit hashes which are cryptographically secure.
+- [Code Styleguide](https://git.eeqj.de/sneak/prompts/raw/branch/main/prompts/CODE_STYLEGUIDE.md)
+  (general, bash, Docker)
+- [Go](https://git.eeqj.de/sneak/prompts/raw/branch/main/prompts/CODE_STYLEGUIDE_GO.md)
+- [JavaScript](https://git.eeqj.de/sneak/prompts/raw/branch/main/prompts/CODE_STYLEGUIDE_JS.md)
+- [Python](https://git.eeqj.de/sneak/prompts/raw/branch/main/prompts/CODE_STYLEGUIDE_PYTHON.md)
+- [Go HTTP Server Conventions](https://git.eeqj.de/sneak/prompts/raw/branch/main/prompts/GO_HTTP_SERVER_CONVENTIONS.md)
 
-- Every repo with software in it must have a Makefile in the root. Each such
-  Makefile should support `make test` (runs the project-specific tests),
-  `make lint`, `make fmt` (writes), `make fmt-check` (readonly), and
-  `make check` (has `test`, `lint`, and `fmt-check` as prereqs), `make docker`
-  (builds docker image).
+---
 
-- Every repo should have a Dockerfile. If the repo contains non-server software,
-  the Dockerfile should bring up a development environment and `make check`
-  (i.e. the docker build should fail if the branch is not green).
+- Cross-project documentation (such as this file) must include
+  `last_modified: YYYY-MM-DD` in the YAML front matter so it can be kept in sync
+  with the authoritative source as policies evolve.
 
-- Platform-specific standard formatting should be used. `black` for python,
-  `prettier` for js/css/etc, `go fmt` for go. The only changes to default
-  settings should be to specify four-space indents where applicable (i.e.
-  everything except `go fmt`).
+- **ALL external references must be pinned by cryptographic hash.** This
+  includes Docker base images, Go modules, npm packages, GitHub Actions, and
+  anything else fetched from a remote source. Version tags (`@v4`, `@latest`,
+  `:3.21`, etc.) are server-mutable and therefore remote code execution
+  vulnerabilities. The ONLY acceptable way to reference an external dependency
+  is by its content hash (Docker `@sha256:...`, Go module hash in `go.sum`, npm
+  integrity hash in lockfile, GitHub Actions `@<commit-sha>`). No exceptions.
+  This also means never `curl | bash` to install tools like pyenv, nvm, rustup,
+  etc. Instead, download a specific release archive from GitHub, verify its hash
+  (hardcoded in the Dockerfile or script), and only then install. Unverified
+  install scripts are arbitrary remote code execution. This is the single most
+  important rule in this document. Double-check every external reference in
+  every file before committing. There are zero exceptions to this rule.
 
-- If local testing is possible (it is not always), `make check` should be a
-  pre-commit hook. If it is not possible, `make lint && make fmt-check` should
-  be a pre-commit hook.
+- Every repo with software must have a root `Makefile` with these targets:
+  `make bootstrap`, `make setup`, `make test`, `make lint`, `make fmt` (writes),
+  `make fmt-check` (read-only), `make check` (runs `test`, `lint`, `fmt-check`),
+  `make docker`, and `make hooks` (installs pre-commit hook). A model Makefile
+  is at `https://git.eeqj.de/sneak/prompts/raw/branch/main/Makefile`.
 
-- If a working `make test` takes more than 20 seconds, that's a bug that needs
-  fixing. In fact, there should be a timeout specified in the `Makefile` that
-  fails it automatically if it takes >30s.
+- Repos follow the
+  [Scripts to Rule Them All](https://github.com/github/scripts-to-rule-them-all)
+  pattern: the implementation of each Makefile target lives in an executable
+  script in `script/` (`script/bootstrap`, `script/setup`, `script/test`,
+  `script/lint`, `script/fmt`, `script/fmt-check`, `script/check`,
+  `script/docker`), and the Makefile targets are thin shims that call them. The
+  scripts must be POSIX sh (`#!/bin/sh`, `set -eu`, no bashisms) so they run in
+  minimal containers (e.g. alpine images have no bash); locate the repo root
+  with `$(cd "$(dirname "$0")/.." && pwd -P)` and `cd` there before acting. From
+  the standard's canonical set we use `bootstrap`, `setup` (make the repo ready
+  for development after a fresh clone: runs `bootstrap`, then
+  `install-precommit`, plus any repo-specific initialization), `test`, and
+  `cibuild`. `script/bootstrap` installs all dependencies idempotently and
+  assumes nothing is present: base tools come from nix, apt, brew, or apk
+  (detected in that order; apt runs noninteractive). For node it uses the
+  installed node if present; otherwise it installs a PINNED node version via
+  nvm, first installing nvm itself if missing — from a hash-verified GitHub
+  release archive (never `curl | sh`), with bash installed as an explicit
+  prerequisite since nvm requires bash. yarn is then pinned via
+  `corepack prepare yarn@<version> --activate`. Never install "latest" or "lts";
+  always exact versions. `script/cibuild` runs the CI build: it changes to the
+  repo root and runs `docker build .`; the Gitea workflow calls it. Four further
+  scripts are our own extensions to the standard: `script/check` runs
+  `script/test`, `script/lint`, and `script/fmt-check`; `script/precommit` is
+  what the git pre-commit hook runs, and it calls `script/check`;
+  `script/install-precommit` installs the git pre-commit hook (the `make hooks`
+  target shims to it); and `script/projectname` (literally that filename) simply
+  outputs the project's name. Scripts that need the name call
+  `script/projectname` — e.g. `script/docker` assembles its image tag from it —
+  so those scripts stay byte-identical across all repos. Repo-type-specific
+  pre-commit extras (e.g. `go mod tidy` verification in Go repos) belong in
+  `script/precommit`, not in the hook itself. Model scripts are at
+  `https://git.eeqj.de/sneak/prompts/raw/branch/main/script/<name>`. The README
+  must document the provided scripts in an **Entrypoints** section (see the
+  README requirements below).
 
-- Docker builds should time out in 5 minutes or less.
+- Always use Makefile targets (`make fmt`, `make test`, `make lint`, etc.)
+  instead of invoking the underlying tools directly. The Makefile is the single
+  source of truth for how these operations are run.
+
+- The Makefile is authoritative documentation for how the repo is used. Beyond
+  the required targets above, it should have targets for every common operation:
+  running a local development server (`make run`, `make dev`), re-initializing
+  or migrating the database (`make db-reset`, `make migrate`), building
+  artifacts (`make build`), generating code, seeding data, or anything else a
+  developer would do regularly. If someone checks out the repo and types
+  `make<tab>`, they should see every meaningful operation available. A new
+  contributor should be able to understand the entire development workflow by
+  reading the Makefile.
+
+- Every repo should have a `Dockerfile`. All Dockerfiles must run `make check`
+  as a build step so the build fails if the branch is not green. For non-server
+  repos, the Dockerfile should bring up a development environment and run
+  `make check`. For server repos, `make check` should run as an early build
+  stage before the final image is assembled. Dockerfiles install development
+  prerequisites by running `script/bootstrap` rather than duplicating installs
+  inline; COPY `script/` and the dependency manifests (`package.json` +
+  `yarn.lock`, `go.mod` + `go.sum`, etc.) before running it so the bootstrap
+  layer stays cached until dependencies change.
+
+- **Dockerfiles must use a separate lint stage for fail-fast feedback.** Go
+  repos use a multistage build where linting runs in an independent stage based
+  on the `golangci/golangci-lint` image (pinned by hash). This stage runs
+  `make fmt-check` and `make lint` before the full build begins. The build stage
+  then declares an explicit dependency on the lint stage via
+  `COPY --from=lint /src/go.sum /dev/null`, which forces BuildKit to complete
+  linting before proceeding to compilation and tests. This ensures lint failures
+  surface in seconds rather than minutes, without blocking on dependency
+  download or compilation in the build stage.
+
+    The standard pattern for a Go repo Dockerfile is:
+
+    ```dockerfile
+    # Lint stage — fast feedback on formatting and lint issues
+    # golangci/golangci-lint:v2.x.x, YYYY-MM-DD
+    FROM golangci/golangci-lint@sha256:... AS lint
+    WORKDIR /src
+    COPY go.mod go.sum ./
+    RUN go mod download
+    COPY . .
+    RUN make fmt-check
+    RUN make lint
+
+    # Build stage
+    # golang:1.x-alpine, YYYY-MM-DD
+    FROM golang@sha256:... AS builder
+    WORKDIR /src
+
+    # Force BuildKit to run the lint stage before proceeding
+    COPY --from=lint /src/go.sum /dev/null
+
+    COPY go.mod go.sum ./
+    RUN go mod download
+    COPY . .
+    RUN make test
+
+    ARG VERSION=dev
+    RUN CGO_ENABLED=0 go build -trimpath \
+        -ldflags="-s -w -X main.Version=${VERSION}" \
+        -o /app ./cmd/app/
+
+    # Runtime stage
+    FROM alpine@sha256:...
+    COPY --from=builder /app /usr/local/bin/app
+    ENTRYPOINT ["app"]
+    ```
+
+    Key points:
+    - The lint stage uses the `golangci/golangci-lint` image directly (it
+      includes both Go and the linter), so there is no need to install the
+      linter separately.
+    - `COPY --from=lint /src/go.sum /dev/null` is a no-op file copy that creates
+      a stage dependency. BuildKit runs stages in parallel by default; without
+      this line, the build stage would not wait for lint to finish and a lint
+      failure might not fail the overall build.
+    - If the project uses `//go:embed` directives that reference build artifacts
+      (e.g. a web frontend compiled in a separate stage), the lint stage must
+      create placeholder files so the embed directives resolve. Example:
+      `RUN mkdir -p web/dist && touch web/dist/index.html web/dist/style.css`.
+      The lint stage should not depend on the actual build output — it exists to
+      fail fast.
+    - If the project requires CGO or system libraries for linting (e.g.
+      `vips-dev`), install them in the lint stage with `apk add`.
+    - The build stage runs `make test` after compilation setup. Tests run in the
+      build stage, not the lint stage, because they may require compiled
+      artifacts or heavier dependencies.
+
+- Every repo should have a Gitea Actions workflow (`.gitea/workflows/`) that
+  runs `script/cibuild` (which runs `docker build .`) on push. Since the
+  Dockerfile already runs `make check`, a successful build implies all checks
+  pass.
+
+- Use platform-standard formatters: `black` for Python, `prettier` for
+  JS/CSS/Markdown/HTML, `go fmt` for Go. Always use default configuration with
+  two exceptions: four-space indents (except Go), and `proseWrap: always` for
+  Markdown (hard-wrap at 80 columns). Documentation and writing repos (Markdown,
+  HTML, CSS) should also have `.prettierrc` and `.prettierignore`.
+
+- Pre-commit hook: runs `script/precommit`, which calls `script/check`. If local
+  testing is not possible in the repo, `script/precommit` may skip `script/test`
+  and run only `script/lint` and `script/fmt-check`. The hook is installed by
+  `script/install-precommit`; the Makefile must provide a `make hooks` target
+  that shims to it.
+
+- All repos with software must have tests that run via the platform-standard
+  test framework (`go test`, `pytest`, `jest`/`vitest`, etc.). If no meaningful
+  tests exist yet, add the most minimal test possible — e.g. importing the
+  module under test to verify it compiles/parses. There is no excuse for
+  `make test` to be a no-op.
+
+- `make test` must complete in under 20 seconds. Add a 30-second timeout in the
+  Makefile.
+
+- **`make test` should use the conditional verbose rerun pattern.** Run tests
+  without `-v` (verbose) first. If tests fail, automatically rerun with `-v` to
+  show full output. This keeps CI logs and `docker build` output clean on
+  success (just package/suite summaries) while providing full diagnostic detail
+  on failure (every test case, every assertion). The general shell pattern:
+
+    ```makefile
+    test:
+    	@<test-command> || \
+    		{ echo "--- Rerunning with -v for details ---"; \
+    		  <test-command-with-v>; exit 1; }
+    ```
+
+    Go example:
+
+    ```makefile
+    test:
+    	@go test -timeout 30s -race -cover ./... || \
+    		{ echo "--- Rerunning with -v for details ---"; \
+    		  go test -timeout 30s -race -v ./...; exit 1; }
+    ```
+
+    Python example:
+
+    ```makefile
+    test:
+    	@python -m pytest || \
+    		{ echo "--- Rerunning with -v for details ---"; \
+    		  python -m pytest -v; exit 1; }
+    ```
+
+    The `exit 1` ensures the target always fails after a rerun — the first run
+    already proved the tests are broken, so the build must not pass even if a
+    flaky test happens to succeed on the second attempt. The rerun exists solely
+    for diagnostic output.
+
+- Docker builds must complete in under 5 minutes.
+
+- `make check` must not modify any files in the repo. Tests may use temporary
+  directories.
 
 - `main` must always pass `make check`, no exceptions.
 
-- Do all changes on a feature branch. You can do whatever you want on a feature
-  branch.
+- Never commit secrets. `.env` files, credentials, API keys, and private keys
+  must be in `.gitignore`. No exceptions.
 
-- We have a standardized `.golangci.yml` which we reuse and is _NEVER_ to be
-  modified by an agent, only manually by the user. It can be copied from
-  `~/dev/upaas/.golangci.yml` if it exists at that location.
+- `.gitignore` should be comprehensive from the start: OS files (`.DS_Store`),
+  editor files (`.swp`, `*~`), language build artifacts, and `node_modules/`.
+  Fetch the standard `.gitignore` from
+  `https://git.eeqj.de/sneak/prompts/raw/branch/main/.gitignore` when setting up
+  a new repo.
 
-- When specifying images or packages by hash in Dockerfiles or
-  `docker-compose.yml`, put a comment above the line and show the version and
-  date at which it was current.
+- **No build artifacts in version control.** Code-derived data (compiled
+  bundles, minified output, generated assets) must never be committed to the
+  repository if it can be avoided. The build process (e.g. Dockerfile, Makefile)
+  should generate these at build time. Notable exception: Go protobuf generated
+  files (`.pb.go`) ARE committed because repos need to work with `go get`, which
+  downloads code but does not execute code generation.
 
-- For javascript, always use `yarn` over `npm`.
+- Never use `git add -A` or `git add .`. Always stage files explicitly by name.
 
-- Whenever writing dates, ALWAYS write YYYY-MM-DD (ISO 8601).
+- Never force-push to `main`.
 
-- Simple projects should be configured with environment variables, as is
-  standard for Dockerized applications.
+- Make all changes on a feature branch. You can do whatever you want on a
+  feature branch.
 
-- Dockerized web services should listen on the default HTTP port of 8080 unless
-  overridden with the `PORT` environment variable.
+- `.golangci.yml` is standardized and must _NEVER_ be modified by an agent, only
+  manually by the user. Fetch from
+  `https://git.eeqj.de/sneak/prompts/raw/branch/main/.golangci.yml`.
 
-- The `README.md` is a project's primary documentation. It should contain at a
-  minimum the following sections:
-    - Description
-        - Include a short and complete description of the functionality and
-          purpose of the software as the first line in the readme. It must
-          include:
-            - the name
-            - the purpose
-            - the category (web server, SPA, command line tool, etc)
-            - the license
-            - the author
-            - eg: "µPaaS is an MIT-licensed Go web application by @sneak that
-              receives git-frontend webhooks and interacts with a Docker server
-              to build and deploy applications in realtime as certain branches
-              are updated."
-    - Getting Started
-        - a code block with copy-pasteable installation/use sections
-    - Rationale
-        - why does this exist?
-    - Design
-        - how is the program structured?
-    - TODO
-        - This is your TODO list for the project - update it meticulously, even
-          in between commits. Whenever planning, put your todo list in the
-          README so that a separate agent with new context can pick up where you
+- When pinning images or packages by hash, add a comment above the reference
+  with the version and date (YYYY-MM-DD).
+
+- Use `yarn`, not `npm`.
+
+- Write all dates as YYYY-MM-DD (ISO 8601).
+
+- Simple projects should be configured with environment variables.
+
+- Dockerized web services listen on port 8080 by default, overridable with
+  `PORT`.
+
+- **HTTP/web services must be hardened for production internet exposure before
+  tagging 1.0.** This means full compliance with security best practices
+  including, without limitation, all of the following:
+    - **Security headers** on every response:
+        - `Strict-Transport-Security` (HSTS) with `max-age` of at least one year
+          and `includeSubDomains`.
+        - `Content-Security-Policy` (CSP) with a restrictive default policy
+          (`default-src 'self'` as a baseline, tightened per-resource as
+          needed). Never use `unsafe-inline` or `unsafe-eval` unless
+          unavoidable, and document the reason.
+        - `X-Frame-Options: DENY` (or `SAMEORIGIN` if framing is required).
+          Prefer the `frame-ancestors` CSP directive as the primary control.
+        - `X-Content-Type-Options: nosniff`.
+        - `Referrer-Policy: strict-origin-when-cross-origin` (or stricter).
+        - `Permissions-Policy` restricting access to browser features the
+          application does not use (camera, microphone, geolocation, etc.).
+    - **Request and response limits:**
+        - Maximum request body size enforced on all endpoints (e.g. Go
+          `http.MaxBytesReader`). Choose a sane default per-route; never accept
+          unbounded input.
+        - Maximum response body size where applicable (e.g. paginated APIs).
+        - `ReadTimeout` and `ReadHeaderTimeout` on the `http.Server` to defend
+          against slowloris attacks.
+        - `WriteTimeout` on the `http.Server`.
+        - `IdleTimeout` on the `http.Server`.
+        - Per-handler execution time limits via `context.WithTimeout` or
+          chi/stdlib `middleware.Timeout`.
+    - **Authentication and session security:**
+        - Rate limiting on password-based authentication endpoints. API keys are
+          high-entropy and not susceptible to brute force, so they are exempt.
+        - CSRF tokens on all state-mutating HTML forms. API endpoints
+          authenticated via `Authorization` header (Bearer token, API key) are
+          exempt because the browser does not attach these automatically.
+        - Passwords stored using bcrypt, scrypt, or argon2 — never plain-text,
+          MD5, or SHA.
+        - Session cookies set with `HttpOnly`, `Secure`, and `SameSite=Lax` (or
+          `Strict`) attributes.
+    - **Reverse proxy awareness:**
+        - True client IP detection when behind a reverse proxy
+          (`X-Forwarded-For`, `X-Real-IP`). The application must accept
+          forwarded headers only from a configured set of trusted proxy
+          addresses — never trust `X-Forwarded-For` unconditionally.
+    - **CORS:**
+        - Authenticated endpoints must restrict `Access-Control-Allow-Origin` to
+          an explicit allowlist of known origins. Wildcard (`*`) is acceptable
+          only for public, unauthenticated read-only APIs.
+    - **Error handling:**
+        - Internal errors must never leak stack traces, SQL queries, file paths,
+          or other implementation details to the client. Return generic error
+          messages in production; detailed errors only when `DEBUG` is enabled.
+    - **TLS:**
+        - Services never terminate TLS directly. They are always deployed behind
+          a TLS-terminating reverse proxy. The service itself listens on plain
+          HTTP. However, HSTS headers and `Secure` cookie flags must still be
+          set by the application so that the browser enforces HTTPS end-to-end.
+
+    This list is non-exhaustive. Apply defense-in-depth: if a standard security
+    hardening measure exists for HTTP services and is not listed here, it is
+    still expected. When in doubt, harden.
+
+- `README.md` is the primary documentation. Required sections:
+    - **Description**: First line must include the project name, purpose,
+      category (web server, SPA, CLI tool, etc.), license, and author. Example:
+      "µPaaS is an MIT-licensed Go web application by @sneak that receives
+      git-frontend webhooks and deploys applications via Docker in realtime."
+    - **Getting Started**: Copy-pasteable install/usage code block.
+    - **Entrypoints**: Opens by stating that the repo adheres to the
+      [Scripts to Rule Them All](https://github.com/github/scripts-to-rule-them-all)
+      standard (with that link), then documents each provided `script/`
+      entrypoint and its purpose.
+    - **Rationale**: Why does this exist?
+    - **Design**: How is the program structured?
+    - **TODO**: Update meticulously, even between commits. When planning, put
+      the todo list in the README so a new agent can pick up where the last one
       left off.
-    - License
-        - GPL or MIT or WTFPL - ask the user when beginning a new project and
-          include a LICENSE file in the root and in a section in the README.
-    - Author
-        - @sneak (link `@sneak` to `https://sneak.berlin`).
+    - **License**: MIT, GPL, or WTFPL. Ask the user for new projects. Include a
+      `LICENSE` file in the repo root and a License section in the README.
+    - **Author**: [@sneak](https://sneak.berlin).
 
-- When beginning a new project, initialize a git repo and make the first commit
-  simply the first version of the README.md in the root of the repo.
+- First commit of a new repo should contain only `README.md`.
 
-- For Go packages, the module root is `sneak.berlin/go/...`, such as
-  `sneak.berlin/go/dnswatcher`.
+- Go module root: `sneak.berlin/go/<name>`. Always run `go mod tidy` before
+  committing.
 
-- We use SemVer always.
+- Use SemVer.
 
-- If no tag `1.0.0` or greater exists in the repository, modify the existing
-  migrations and assume no installed base or existing databases. If `>=1.0.0`,
-  database changes add new migration files.
+- Database migrations live in `internal/db/migrations/` and must be embedded in
+  the binary.
+    - `000_migration.sql` — contains ONLY the creation of the migrations
+      tracking table itself. Nothing else.
+    - `001_schema.sql` — the full application schema.
+    - **Pre-1.0.0:** never add additional migration files (002, 003, etc.).
+      There is no installed base to migrate. Edit `001_schema.sql` directly.
+    - **Post-1.0.0:** add new numbered migration files for each schema change.
+      Never edit existing migrations after release.
 
-- New repos must have at a minimum the following files:
-    - `README.md`, `.git`, `.gitignore`
-    - `POLICIES.md` (copy from `~/Documents/_PROMPTS/POLICIES.md`)
+- All repos should have an `.editorconfig` enforcing the project's indentation
+  settings.
+
+- Avoid putting files in the repo root unless necessary. Root should contain
+  only project-level config files (`README.md`, `Makefile`, `Dockerfile`,
+  `LICENSE`, `.gitignore`, `.editorconfig`, `REPO_POLICIES.md`, and
+  language-specific config). Everything else goes in a subdirectory. Canonical
+  subdirectory names:
+    - `bin/` — executable scripts and tools
+    - `cmd/` — Go command entrypoints
+    - `configs/` — configuration templates and examples
+    - `deploy/` — deployment manifests (k8s, compose, terraform)
+    - `docs/` — documentation and markdown (README.md stays in root)
+    - `internal/` — Go internal packages
+    - `internal/db/migrations/` — database migrations
+    - `pkg/` — Go library packages
+    - `share/` — systemd units, data files
+    - `static/` — static assets (images, fonts, etc.)
+    - `web/` — web frontend source
+
+- When setting up a new repo, files from the `prompts` repo may be used as
+  templates. Fetch them from
+  `https://git.eeqj.de/sneak/prompts/raw/branch/main/<path>`.
+
+- New repos must contain at minimum:
+    - `README.md`, `.git`, `.gitignore`, `.editorconfig`
+    - `LICENSE`, `REPO_POLICIES.md` (copy from the `prompts` repo)
+    - `Makefile`
+    - `script/` entrypoints (`bootstrap`, `setup`, `projectname`, `test`,
+      `lint`, `fmt`, `fmt-check`, `check`, `docker`, `cibuild`, `precommit`,
+      `install-precommit`)
     - `Dockerfile`, `.dockerignore`
-    - for go: `go.mod`, `go.sum`, `.golangci.yml`
-    - for js: `package.json`
+    - `.gitea/workflows/check.yml`
+    - Go: `go.mod`, `go.sum`, `.golangci.yml`
+    - JS: `package.json`, `yarn.lock`, `.prettierrc`, `.prettierignore`
+    - Python: `pyproject.toml`

TODO.md

@@ -0,0 +1,56 @@
+# Workflow
+
+- branch (from `main`)
+- do the work in Next Step
+- move Next Step to the top of Completed Steps
+- move the top item of Future Steps into Next Step
+- commit (`TODO.md` changes in the same commit as the work)
+- merge to `main` if the branch is not protected, otherwise open a PR
+- push
+
+# Status
+
+pre-1.0. No git tags. Backend work in flight on feat/reportbuf-storage (dirty:
+src/main.js). Frontend is functional; backend is new and unmerged.
+
+# Next Step
+
+Land feat/reportbuf-storage: finish the in-progress src/main.js change, get make
+check green, and merge the branch to main. The branch adds the backend (buffered
+zstd-compressed report storage), the CI workflow, and backend repo standard
+files, so merging it also closes most compliance gaps.
+
+# Completed Steps
+
+- 2026-08-09: automated responsive-layout harness
+  (`make frontend-viewport-test`): digest-pinned headless Chrome driven over CDP
+  against the built `dist/`, viewport widths derived from the breakpoints in
+  `src/styles.css` (#13). Every check carries a presence guard so none of them
+  can pass against a page it is not actually measuring. Found two real layout
+  defects, filed as #42 and #43
+- 2026-07-07 Adopted scripts-to-rule-them-all: `script/` entrypoints, Makefile
+  shims, README Entrypoints section
+- 2026-02-27: backend with buffered zstd-compressed report storage; CI workflow
+  and backend repo standard files; backend Dockerfile fixed (Go 1.25,
+  golangci-lint) and moved to repo root (feat/reportbuf-storage, unmerged)
+- 2026-02-26: host row layout redesigned with CSS grid; overflow and spacing
+  fixes; nginx config extracted; port hardcoded to 8080
+- 2026-02-26: debug log panel, median stats, recovery probe, Docker build fix,
+  S3 Singapore endpoint added
+- 2026-02-23: summary box redesign, host pinning, local and UTC clocks, checks
+  counter
+- 2026-02-23: hosts sorted by latency; GET instead of HEAD for latency; timeout
+  derived from interval; Hetzner regional endpoints; 3s interval
+- 2026-01-29: initial NetWatch network latency monitor
+
+# Future Steps
+
+- Fix the two layout defects the viewport harness found (#42 horizontal overflow
+  at 320px, #43 tap targets below 44x44), then wire
+  `script/frontend-viewport-test` into CI as its own step
+- Compliance top-up as one small commit: add .editorconfig and add the hooks
+  target to the Makefile
+- After merge, confirm .gitea/workflows/check.yml is on main and CI is green
+  (main always green policy)
+- Decide what to do with untracked resume.sh: commit it, gitignore it, or delete
+  it

package.json

@@ -14,6 +14,7 @@
         "autoprefixer": "^10.4.23",
         "postcss": "^8.5.6",
         "prettier": "^3.8.1",
+        "puppeteer-core": "25.5.0",
         "tailwindcss": "^4.1.18",
         "vite": "^7.3.1"
     }

script/bootstrap

@@ -0,0 +1,143 @@
+#!/bin/sh
+# script/bootstrap: install all dependencies needed to build and develop
+# this repo. Idempotent: every install is guarded by a check so already
+# installed tools are skipped. Base tooling comes from nix, apt, brew,
+# or apk (detected in that order); assumes nothing is present. Node is
+# used directly if installed; otherwise it is installed at a pinned
+# version via nvm (installing nvm itself first, from a hash-verified
+# release archive, never curl | sh).
+set -eu
+
+ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"
+
+# Pinned versions, 2026-07-07
+NODE_VERSION="22.17.0"
+NVM_VERSION="0.40.3"
+# sha256 of https://github.com/nvm-sh/nvm/archive/refs/tags/v0.40.3.tar.gz
+NVM_SHA256="5f4d6aaa04a177dc93c985e31dbc411ab6b8c6e1e21d8015dbc1372625fcd1d0"
+YARN_VERSION="1.22.22"
+
+PKGMGR=""
+SUDO=""
+APT_UPDATED=""
+
+detect_pkgmgr() {
+    [ -n "$PKGMGR" ] && return 0
+    if command -v nix-env >/dev/null 2>&1; then
+        PKGMGR="nix"
+    elif command -v apt-get >/dev/null 2>&1; then
+        PKGMGR="apt"
+    elif command -v brew >/dev/null 2>&1; then
+        PKGMGR="brew"
+    elif command -v apk >/dev/null 2>&1; then
+        PKGMGR="apk"
+    else
+        echo "bootstrap: no supported package manager (nix, apt, brew, apk)" >&2
+        exit 1
+    fi
+    if [ "$PKGMGR" = "apt" ]; then
+        export DEBIAN_FRONTEND=noninteractive
+        if [ "$(id -u)" != "0" ]; then
+            SUDO="sudo"
+        fi
+    fi
+}
+
+# pkg_install <nix-attr> <apt-pkg> <brew-formula> <apk-pkg>
+pkg_install() {
+    detect_pkgmgr
+    case "$PKGMGR" in
+        nix) nix-env -iA "nixpkgs.$1" ;;
+        apt)
+            if [ -z "$APT_UPDATED" ]; then
+                $SUDO env DEBIAN_FRONTEND=noninteractive apt-get update
+                APT_UPDATED=1
+            fi
+            $SUDO env DEBIAN_FRONTEND=noninteractive apt-get install -y "$2"
+            ;;
+        brew) brew install "$3" ;;
+        apk) apk add --no-cache "$4" ;;
+    esac
+}
+
+missing() {
+    ! command -v "$1" >/dev/null 2>&1
+}
+
+# verify_sha256 <file> <expected-hash>
+verify_sha256() {
+    if command -v sha256sum >/dev/null 2>&1; then
+        actual="$(sha256sum "$1" | cut -d' ' -f1)"
+    else
+        actual="$(shasum -a 256 "$1" | cut -d' ' -f1)"
+    fi
+    if [ "$actual" != "$2" ]; then
+        echo "bootstrap: sha256 mismatch for $1" >&2
+        echo "  expected: $2" >&2
+        echo "  actual:   $actual" >&2
+        exit 1
+    fi
+}
+
+# nvm is a bash script; run a command in a bash with nvm loaded
+nvm_sh() {
+    bash -c ". \"\$HOME/.nvm/nvm.sh\" && $*"
+}
+
+ensure_nvm() {
+    [ -s "$HOME/.nvm/nvm.sh" ] && return 0
+    # nvm prerequisites; nvm itself requires bash
+    if missing bash; then pkg_install bash bash bash bash; fi
+    if missing curl; then pkg_install curl curl curl curl; fi
+    if missing git; then pkg_install git git git git; fi
+    tmp="$(mktemp -d)"
+    curl -fsSL -o "$tmp/nvm.tar.gz" \
+        "https://github.com/nvm-sh/nvm/archive/refs/tags/v${NVM_VERSION}.tar.gz"
+    verify_sha256 "$tmp/nvm.tar.gz" "$NVM_SHA256"
+    mkdir -p "$HOME/.nvm"
+    tar -xzf "$tmp/nvm.tar.gz" -C "$HOME/.nvm" --strip-components=1
+    rm -rf "$tmp"
+}
+
+ensure_node() {
+    if ! missing node; then return 0; fi
+    ensure_nvm
+    nvm_sh "nvm install $NODE_VERSION"
+}
+
+ensure_yarn() {
+    if ! missing yarn; then return 0; fi
+    if ! missing corepack; then
+        corepack enable
+        corepack prepare "yarn@$YARN_VERSION" --activate
+    elif [ -s "$HOME/.nvm/nvm.sh" ]; then
+        nvm_sh "nvm use $NODE_VERSION >/dev/null && corepack enable && \
+            corepack prepare yarn@$YARN_VERSION --activate"
+    else
+        npm install -g "yarn@$YARN_VERSION"
+    fi
+}
+
+install_js_deps() {
+    if missing yarn && [ -s "$HOME/.nvm/nvm.sh" ]; then
+        nvm_sh "nvm use $NODE_VERSION >/dev/null && cd \"$ROOT\" && \
+            yarn install --frozen-lockfile"
+    else
+        yarn install --frozen-lockfile
+    fi
+}
+
+main() {
+    cd "$ROOT"
+
+    if missing make; then pkg_install gnumake make make make; fi
+    if missing git; then pkg_install git git git git; fi
+
+    ensure_node
+    ensure_yarn
+    install_js_deps
+
+    echo "bootstrap complete"
+}
+
+main "$@"

script/check

@@ -0,0 +1,14 @@
+#!/bin/sh
+# script/check: run all checks (test, lint, fmt-check). Our own
+# extension to scripts-to-rule-them-all. Must not modify any files.
+set -eu
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd -P)"
+
+main() {
+    "$SCRIPT_DIR/test"
+    "$SCRIPT_DIR/lint"
+    "$SCRIPT_DIR/fmt-check"
+}
+
+main "$@"

script/cibuild

@@ -0,0 +1,13 @@
+#!/bin/sh
+# script/cibuild: run the CI build. The Dockerfile runs make check, so
+# a successful build implies all checks pass.
+set -eu
+
+ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"
+
+main() {
+    cd "$ROOT"
+    docker build .
+}
+
+main "$@"

script/docker

@@ -0,0 +1,14 @@
+#!/bin/sh
+# script/docker: build the Docker image tagged with the project name.
+# The tag comes from script/projectname.
+set -eu
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd -P)"
+ROOT="$(cd "$SCRIPT_DIR/.." && pwd -P)"
+
+main() {
+    cd "$ROOT"
+    timeout 300 docker build -t "$("$SCRIPT_DIR/projectname")" .
+}
+
+main "$@"

script/fmt

@@ -0,0 +1,12 @@
+#!/bin/sh
+# script/fmt: format all files (writes).
+set -eu
+
+ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"
+
+main() {
+    cd "$ROOT"
+    yarn prettier --write .
+}
+
+main "$@"

script/fmt-check

@@ -0,0 +1,13 @@
+#!/bin/sh
+# script/fmt-check: check formatting (read-only). Same scope as
+# script/fmt, but fails instead of writing.
+set -eu
+
+ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"
+
+main() {
+    cd "$ROOT"
+    yarn prettier --check .
+}
+
+main "$@"

script/frontend-viewport-test

@@ -0,0 +1,102 @@
+#!/bin/sh
+# script/frontend-viewport-test: verify the responsive layout of the built
+# frontend in a real browser engine.
+#
+# Builds dist/, serves it with the same nginx image and the same nginx.conf
+# the shipping container uses, points a containerised headless Chrome at it
+# over CDP, and asserts on computed layout at every viewport width derived
+# from the app's own CSS. See test/viewport/README.md for what this covers
+# and what it cannot.
+#
+# Deliberately not part of script/check: it needs Docker and takes far
+# longer than the 20s budget make test has to stay inside.
+set -eu
+
+ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"
+
+# chromedp/headless-shell 151.0.7922.109, 2026-08-09
+BROWSER_IMAGE="chromedp/headless-shell@sha256:2d349b544a1ea6b5b5fd7c0fe99215ff662339c57407ee2e8c0a11af93516b04"
+# nginx:stable-alpine, 2026-02-22 (the digest Dockerfile ships)
+SERVER_IMAGE="nginx@sha256:15e96e59aa3b0aada3a121296e3bce117721f42d88f5f64217ef4b18f458c6ab"
+# node:22-alpine, 2026-02-22 (the digest Dockerfile builds with)
+NODE_IMAGE="node@sha256:e4bf2a82ad0a4037d28035ae71529873c069b13eb0455466ae0bc13363826e34"
+
+RUN_ID="$$-$(date +%s)"
+NETWORK="netwatch-viewport-$RUN_ID"
+SERVER="netwatch-viewport-server-$RUN_ID"
+BROWSER="netwatch-viewport-browser-$RUN_ID"
+HARNESS="netwatch-viewport-harness-$RUN_ID"
+ARTIFACT_DIR="$ROOT/tmp/viewport"
+
+# Every container is named and removed here, including the harness itself:
+# `timeout` below kills the `docker run` client, not the container it
+# started, and an unnamed survivor keeps the --internal network in use so
+# `docker network rm` fails too. This host runs many sessions at once and
+# neither may be left behind.
+cleanup() {
+    docker rm -f "$HARNESS" > /dev/null 2>&1 || true
+    docker rm -f "$BROWSER" > /dev/null 2>&1 || true
+    docker rm -f "$SERVER" > /dev/null 2>&1 || true
+    docker network rm "$NETWORK" > /dev/null 2>&1 || true
+}
+trap cleanup EXIT INT TERM
+
+main() {
+    cd "$ROOT"
+
+    # Test what ships: the production build, not a dev server.
+    "$ROOT/script/test"
+    if [ ! -f "$ROOT/dist/index.html" ]; then
+        echo "frontend-viewport-test: dist/index.html missing after build" >&2
+        exit 1
+    fi
+
+    mkdir -p "$ARTIFACT_DIR"
+
+    # An --internal network has no route off the host, so the browser
+    # cannot reach the real internet no matter what the page asks for.
+    # Latency probes are answered by the harness instead. This also means
+    # no port can be published from it, which is why the harness itself
+    # runs as a third container on the same network rather than on the
+    # host.
+    docker network create --internal "$NETWORK" > /dev/null
+
+    docker run -d --rm --name "$SERVER" \
+        --network "$NETWORK" --network-alias netwatch \
+        -v "$ROOT/dist:/usr/share/nginx/html:ro" \
+        -v "$ROOT/nginx.conf:/etc/nginx/conf.d/default.conf:ro" \
+        "$SERVER_IMAGE" > /dev/null
+
+    # The image's own entrypoint already exposes CDP on 9222 and passes
+    # --no-sandbox, so only extra flags belong here; re-specifying the
+    # debugging port collides with it and leaves the endpoint bound to
+    # loopback only. --hide-scrollbars keeps innerWidth equal to
+    # clientWidth, so the overflow assertion has no scrollbar-sized slack
+    # to hide behind, and matches the overlay scrollbars phones use.
+    docker run -d --rm --name "$BROWSER" --init --shm-size=1g \
+        --network "$NETWORK" \
+        "$BROWSER_IMAGE" \
+        --hide-scrollbars \
+        > /dev/null
+
+    # Chrome refuses DevTools requests whose Host header is neither
+    # localhost nor an IP address, so dial the container by address rather
+    # than by its network alias.
+    browser_ip="$(docker inspect \
+        -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' \
+        "$BROWSER")"
+
+    timeout 900 docker run --rm --init --name "$HARNESS" \
+        --network "$NETWORK" \
+        --user "$(id -u):$(id -g)" \
+        -v "$ROOT:/app" \
+        -w /app \
+        -e NETWATCH_ROOT=/app \
+        -e NETWATCH_BASE_URL=http://netwatch:8080 \
+        -e "NETWATCH_CDP_URL=http://$browser_ip:9222" \
+        -e NETWATCH_ARTIFACT_DIR=/app/tmp/viewport \
+        "$NODE_IMAGE" \
+        node test/viewport/harness.js
+}
+
+main "$@"

script/install-precommit

@@ -0,0 +1,16 @@
+#!/bin/sh
+# script/install-precommit: install the git pre-commit hook that runs
+# script/precommit. Our own extension to scripts-to-rule-them-all.
+set -eu
+
+ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"
+
+main() {
+    cd "$ROOT"
+    hook=".git/hooks/pre-commit"
+    printf '#!/bin/sh\nset -e\nscript/precommit\n' > "$hook"
+    chmod +x "$hook"
+    echo "pre-commit hook installed: runs script/precommit"
+}
+
+main "$@"

script/lint

@@ -0,0 +1,12 @@
+#!/bin/sh
+# script/lint: run the linter (prettier in check mode).
+set -eu
+
+ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"
+
+main() {
+    cd "$ROOT"
+    yarn prettier --check .
+}
+
+main "$@"

script/precommit

@@ -0,0 +1,12 @@
+#!/bin/sh
+# script/precommit: run by the git pre-commit hook; fails the commit if
+# checks fail. Our own extension to scripts-to-rule-them-all.
+set -eu
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd -P)"
+
+main() {
+    "$SCRIPT_DIR/check"
+}
+
+main "$@"

script/projectname

@@ -0,0 +1,12 @@
+#!/bin/sh
+# script/projectname: output the name of this project. Our own
+# extension to scripts-to-rule-them-all. Other scripts that need the
+# name (e.g. script/docker) call this, so they can stay identical
+# across all repos.
+set -eu
+
+main() {
+    echo "netwatch"
+}
+
+main "$@"

script/setup

@@ -0,0 +1,13 @@
+#!/bin/sh
+# script/setup: set up the repo for development after a fresh clone:
+# installs dependencies and the git pre-commit hook.
+set -eu
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd -P)"
+
+main() {
+    "$SCRIPT_DIR/bootstrap"
+    "$SCRIPT_DIR/install-precommit"
+}
+
+main "$@"

script/test

@@ -0,0 +1,13 @@
+#!/bin/sh
+# script/test: run the test suite. This repo has no unit tests; the
+# production build serves as the test (fails on broken code).
+set -eu
+
+ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"
+
+main() {
+    cd "$ROOT"
+    timeout 30 yarn build
+}
+
+main "$@"

src/styles.css

@@ -21,3 +21,96 @@ body {
         rgba(255, 255, 255, 0) 100%
     );
 }
+
+/* ---- Mobile responsive layout (portrait / narrow viewports) ---- */
+@media (max-width: 768px) {
+    /* Header: stack title and controls vertically */
+    header .flex.items-center.justify-between {
+        flex-direction: column;
+        align-items: flex-start !important;
+        gap: 1rem;
+    }
+
+    header .flex.flex-col.items-end {
+        align-items: flex-start !important;
+        flex-direction: row;
+        flex-wrap: wrap;
+        gap: 0.75rem;
+    }
+
+    /* Pause button: smaller on mobile */
+    #pause-btn {
+        padding: 0.5rem 1rem;
+    }
+
+    #pause-btn svg {
+        width: 1.25rem;
+        height: 1.25rem;
+    }
+
+    #pause-text {
+        font-size: 0.875rem;
+    }
+
+    /* Summary box: wrap into a grid for readability */
+    #summary {
+        display: flex;
+        flex-wrap: wrap;
+        gap: 0.25rem 0.5rem;
+        justify-content: center;
+        line-height: 1.6;
+    }
+
+    /* Hide the pipe separators on mobile */
+    #summary .text-gray-600.mx-3 {
+        display: none;
+    }
+
+    /* Host row: stack vertically */
+    .host-row .flex.items-center.gap-4 {
+        flex-direction: column;
+        align-items: stretch !important;
+        gap: 0.5rem;
+    }
+
+    /* Info section: full width, remove fixed width */
+    .host-row .w-\[420px\] {
+        width: 100% !important;
+        display: grid;
+        grid-template-columns: 1fr auto;
+        align-items: center;
+    }
+
+    /* Host name row with dot */
+    .host-row .flex.items-center.gap-2.min-w-\[200px\] {
+        min-width: 0;
+    }
+
+    /* Latency value: slightly smaller on mobile */
+    .host-row .latency-value {
+        font-size: 1.875rem;
+        line-height: 2.25rem;
+    }
+
+    /* Sparkline: full width below the info */
+    .host-row .sparkline-container {
+        width: 100%;
+        flex-shrink: 0;
+    }
+
+    /* Pin button: inline with the host info */
+    .host-row .pin-btn {
+        position: absolute;
+        right: 0.5rem;
+        top: 0.5rem;
+    }
+
+    .host-row {
+        position: relative;
+    }
+
+    /* Footer legend: wrap nicely */
+    footer p {
+        line-height: 1.8;
+    }
+}

test/viewport/README.md

@@ -0,0 +1,112 @@
+# Responsive-layout harness
+
+Automated verification of the responsive layout that landed in #5. Run it with:
+
+```bash
+make frontend-viewport-test
+```
+
+It builds `dist/`, serves it from the same digest-pinned `nginx` image and the
+same `nginx.conf` the shipping container uses, drives a digest-pinned headless
+Chrome against it over CDP, and asserts on computed layout at every viewport
+width derived from the app's own CSS. Screenshots land in `tmp/viewport/`
+alongside a `results.json`; they are artifacts for a human to look at when
+something fails, not the evidence. The assertions are the evidence.
+
+The target is deliberately outside `make check`: it needs Docker and takes
+minutes, and `make test` has to stay under 20 seconds.
+
+## How the widths are chosen
+
+Not from a list of phone models. `viewports.js` parses the `@media` conditions
+out of `src/styles.css` and scans `src/main.js` and `index.html` for Tailwind
+responsive prefixes, then tests every breakpoint it finds at one pixel below it,
+exactly on it, and one pixel above it. A generic 375px "phone" test sails
+straight past an off-by-one at a media query boundary; `max-width: 768px`
+matches _at_ 768, and the sweep pins down which side of that line each layout is
+on.
+
+Nothing hardcodes 768. Add a second media block or start using `md:` classes and
+the new breakpoint is covered without this directory being touched. The app is
+desktop-first today (all narrow rules live in `max-width` blocks); a
+`min-width`-only, mobile-first set is handled as its inverse, and a set that
+mixes the two makes the run fail loudly rather than test the right widths with
+the wrong expectation. Four further viewports are fixed anchors, each with a
+stated reason: a 320px floor, a 1280px desktop baseline, and two phone-landscape
+sizes straddling the breakpoint for the rotation case.
+
+## What it asserts
+
+- **app-rendered** — enough host rows exist and enough of them show a numeric
+  latency. This one exists so the rest cannot pass vacuously against a blank
+  page.
+- **no-horizontal-overflow** — `documentElement.scrollWidth` fits the layout
+  viewport, with the widest offending element named.
+- **nothing-past-viewport-edge** — no visible element's box extends past the
+  viewport edge.
+- **no-clipped-text** — nothing hides text behind `overflow: hidden`. Deliberate
+  ellipsis truncation (Tailwind's `truncate`, used on host names and URLs) is
+  excluded: it is a design choice, not breakage.
+- **tap-targets-44px** — every interactive control is at least 44x44 CSS px on
+  touch viewports, _and_ each selector in the control list matched at least the
+  number of visible elements it declares. The second half is what stops the
+  check passing vacuously: with size alone, a renamed class would take its
+  controls out of the measured set and the check would report "all 0 controls
+  are at least 44x44" and pass. See below.
+- **host-rows-stacked / host-rows-side-by-side** — the rows genuinely reflow.
+  Computed `flex-direction` _and_ the actual geometry are checked, and in the
+  narrow layout the info block and the sparkline must each occupy essentially
+  the full row width. A row that merely shrank its 420px column would fail.
+- **probing-still-runs / gateway-detection-still-runs** — narrow viewports keep
+  probing and keep detecting the gateway. The mobile early-return path proposed
+  in #8 was rejected; this is what would catch it coming back.
+
+### The tap-target threshold
+
+44x44 CSS px. That is the figure in Apple's Human Interface Guidelines and in
+WCAG 2.2 SC 2.5.5 "Target Size (Enhanced)". WCAG 2.2 SC 2.5.8 (level AA) sets a
+lower 24x24 floor, but that floor comes with a spacing exception these controls
+do not qualify for — the pin buttons sit directly against the host name they
+belong to.
+
+## Determinism
+
+The browser container runs on an `--internal` docker network and has no route to
+the internet, so the app's latency probes cannot reach anything real. The
+harness answers them itself from a fixed delay table, with a deterministic
+fraction failed outright, so the rows render a realistic spread of one-, two-
+and three-digit latencies plus some unreachable rows. That spread is what the
+layout has to survive; 24 identical `---` placeholders would not exercise it.
+
+## What this cannot verify
+
+Real limits, so nobody re-parks this issue as needing hardware:
+
+- **Non-Chromium engines.** This is Chrome. iOS Safari is WebKit and cannot be
+  emulated by it; Safari-specific bugs (viewport units under a collapsing URL
+  bar, `-webkit-fill-available`, form control metrics) will not show up here.
+- **Real touch input.** `hasTouch` emulation changes what the page is told, not
+  how a finger behaves. Gesture handling, scroll momentum, double-tap zoom and
+  hover-state fallbacks on touch are out of scope.
+- **Physical pixel density and rendering.** `deviceScaleFactor` is set, but
+  subpixel antialiasing, OLED colour rendering and actual legibility at a given
+  physical size are not measurable here.
+- **Fonts.** The container has DejaVu, not the platform's own UI monospace. Text
+  metrics are therefore close to, but not identical to, a real device — a layout
+  that fits here by a few pixels might not there.
+- **On-device performance.** Canvas sparkline redraw cost, battery, and
+  behaviour on a slow radio are not measured.
+- **Browser chrome.** The address bar, safe-area insets and notch cutouts are
+  not simulated.
+
+Everything else this issue was actually about — does the layout reflow, does
+anything overflow, is content clipped, are the controls big enough — is a
+function of viewport width and CSS, and is covered above.
+
+## Relation to the unit test framework (#21)
+
+Complementary layers, not two stacks. `vitest` (#21) will exercise module-level
+logic in-process with no browser. This harness exercises rendered layout in a
+real engine and is the only thing here that can see a media query. Neither
+replaces the other; assertions about computed styles and element geometry belong
+here, assertions about functions belong in `vitest`.

test/viewport/checks.js

@@ -0,0 +1,245 @@
+// Pass/fail decisions for the responsive-layout harness.
+//
+// Kept in node rather than in the page so that a failure can be reported
+// with the measurements that produced it. Every check runs at every
+// viewport; none of them short-circuits, so one failure does not hide the
+// rest.
+
+// Minimum tap target, in CSS pixels. 44x44 is the figure in Apple's Human
+// Interface Guidelines and in WCAG 2.2 SC 2.5.5 "Target Size (Enhanced)".
+// WCAG 2.2 SC 2.5.8 (level AA) sets a lower 24x24 floor, but that floor
+// comes with a spacing exception these controls do not qualify for: the
+// pin buttons sit directly against the host name they belong to. Held at
+// 44 deliberately.
+export const MIN_TAP_TARGET_PX = 44;
+
+// The controls named in the definition of done, plus the pause button.
+// Each carries the smallest number of *visible* instances the page has to
+// contain for the tap-target oracle to be measuring anything at all.
+//
+// Without those floors the check is inert: `undersized` is empty both when
+// every control is large enough and when the selectors have gone stale and
+// matched nothing, and the pass condition cannot tell those apart. A single
+// combined floor would not be enough either — 26 pin buttons would cover
+// for all three singleton controls vanishing at once — so the floor is per
+// selector, and one stale selector out of four fails the check.
+export const INTERACTIVE_CONTROLS = [
+    { selector: "#pause-btn", minCount: 1 },
+    { selector: "#interval-select", minCount: 1 },
+    // One per pinnable host row. `app-rendered` already requires at least
+    // 10 host rows, so a count below that means the pin buttons stopped
+    // being rendered per row rather than that there were fewer hosts.
+    { selector: ".pin-btn", minCount: 10 },
+    { selector: "#debug-toggle", minCount: 1 },
+];
+
+export const INTERACTIVE_SELECTORS = INTERACTIVE_CONTROLS.map(
+    (control) => control.selector,
+);
+
+// A host row is only "reflowed" if it stacked *and* went full width.
+// A row that merely shrank its 420px info column would keep
+// flex-direction: row, and a row that stacked but left the info column at
+// its fixed width would fail the width test.
+const FULL_WIDTH_FRACTION = 0.9;
+
+function summarise(items, format, limit = 3) {
+    const shown = items.slice(0, limit).map(format).join("; ");
+    const rest = items.length > limit ? ` (+${items.length - limit} more)` : "";
+    return shown + rest;
+}
+
+// Collapse an overflow report to the elements actually responsible.
+// Identical elements (24 host rows all doing the same thing) are counted
+// rather than listed, and the deepest ones come first, since every
+// ancestor of an overflowing element also reports as overflowing.
+function deepestOffenders(entries) {
+    const byElement = new Map();
+    for (const entry of entries) {
+        const reach = entry.reach ?? entry.right;
+        const existing = byElement.get(entry.el);
+        if (existing) {
+            existing.count += 1;
+            existing.reach = Math.max(existing.reach, reach);
+        } else {
+            byElement.set(entry.el, { ...entry, reach, count: 1 });
+        }
+    }
+    return [...byElement.values()].sort(
+        (a, b) => b.depth - a.depth || b.reach - a.reach,
+    );
+}
+
+function checkRowLayout(row, expectStacked) {
+    if (expectStacked) {
+        if (row.flexDirection !== "column") {
+            return `row ${row.index}: flex-direction is ${row.flexDirection}, expected column`;
+        }
+        if (row.sparkline.top < row.info.bottom - 1) {
+            return `row ${row.index}: sparkline top ${row.sparkline.top} is above info bottom ${row.info.bottom} — still side by side`;
+        }
+        const minWidth = row.containerWidth * FULL_WIDTH_FRACTION;
+        if (row.info.width < minWidth) {
+            return `row ${row.index}: info block is ${row.info.width}px of ${row.containerWidth}px — shrunk, not reflowed`;
+        }
+        if (row.sparkline.width < minWidth) {
+            return `row ${row.index}: sparkline is ${row.sparkline.width}px of ${row.containerWidth}px — shrunk, not reflowed`;
+        }
+        return null;
+    }
+
+    if (row.flexDirection !== "row") {
+        return `row ${row.index}: flex-direction is ${row.flexDirection}, expected row`;
+    }
+    if (row.sparkline.left < row.info.right - 1) {
+        return `row ${row.index}: sparkline left ${row.sparkline.left} overlaps info right ${row.info.right} — not side by side`;
+    }
+    return null;
+}
+
+export function evaluateChecks(facts, viewport, probes) {
+    const checks = [];
+    const check = (name, ok, detail) => checks.push({ name, ok, detail });
+
+    // Guard against the whole harness passing vacuously because the page
+    // never rendered. Everything below is only meaningful if this holds.
+    check(
+        "app-rendered",
+        facts.rowCount >= 10 && facts.numericLatencies >= 5,
+        `${facts.rowCount} host rows, ${facts.numericLatencies} showing a numeric latency`,
+    );
+
+    const viewportWidth = Math.min(facts.innerWidth, facts.documentClientWidth);
+    const culprits = deepestOffenders([
+        ...facts.overflowing,
+        ...facts.contentOverflowing,
+    ]);
+    check(
+        "no-horizontal-overflow",
+        facts.documentScrollWidth <= viewportWidth,
+        `documentElement.scrollWidth ${facts.documentScrollWidth} vs viewport ${viewportWidth}` +
+            (culprits.length === 0
+                ? ""
+                : "; widest content: " +
+                  summarise(
+                      culprits,
+                      (c) =>
+                          `${c.el} reaches ${Math.round(c.reach)}px${c.count > 1 ? ` (x${c.count})` : ""}`,
+                  )),
+    );
+
+    check(
+        "nothing-past-viewport-edge",
+        facts.overflowing.length === 0,
+        facts.overflowing.length === 0
+            ? "no element extends past the viewport"
+            : `${facts.overflowing.length} element(s) past the edge: ` +
+                  summarise(
+                      facts.overflowing,
+                      (o) => `${o.el} spans ${o.left}..${o.right}`,
+                  ),
+    );
+
+    check(
+        "no-clipped-text",
+        facts.clipped.length === 0,
+        facts.clipped.length === 0
+            ? "no element hides text behind overflow (deliberate ellipsis excluded)"
+            : `${facts.clipped.length} element(s) clipping text: ` +
+                  summarise(
+                      facts.clipped,
+                      (c) =>
+                          `${c.el} scrollWidth ${c.scrollWidth} > clientWidth ${c.clientWidth}`,
+                  ),
+    );
+
+    if (viewport.touch) {
+        // Presence first: a selector that matches nothing contributes no
+        // undersized targets, so without this the check would report
+        // "all 0 controls are at least 44x44" and pass.
+        const seen = new Map();
+        for (const target of facts.tapTargets) {
+            seen.set(target.selector, (seen.get(target.selector) ?? 0) + 1);
+        }
+        const missing = INTERACTIVE_CONTROLS.filter(
+            (control) => (seen.get(control.selector) ?? 0) < control.minCount,
+        );
+
+        const undersized = facts.tapTargets.filter(
+            (t) => t.width < MIN_TAP_TARGET_PX || t.height < MIN_TAP_TARGET_PX,
+        );
+        const bySelector = new Map();
+        for (const target of undersized) {
+            const existing = bySelector.get(target.selector);
+            if (!existing || target.width * target.height < existing.area) {
+                bySelector.set(target.selector, {
+                    ...target,
+                    area: target.width * target.height,
+                    count: (existing?.count ?? 0) + 1,
+                });
+            } else {
+                existing.count += 1;
+            }
+        }
+        const detail = [];
+        if (missing.length > 0) {
+            detail.push(
+                "oracle is not measuring the page: " +
+                    summarise(
+                        missing,
+                        (c) =>
+                            `${c.selector} matched ${seen.get(c.selector) ?? 0} visible element(s), expected at least ${c.minCount}`,
+                        4,
+                    ),
+            );
+        }
+        detail.push(
+            undersized.length === 0
+                ? `${facts.tapTargets.length} controls measured, all at least ${MIN_TAP_TARGET_PX}x${MIN_TAP_TARGET_PX}`
+                : `${undersized.length} of ${facts.tapTargets.length} controls below ${MIN_TAP_TARGET_PX}x${MIN_TAP_TARGET_PX}: ` +
+                      summarise(
+                          [...bySelector.values()],
+                          (t) =>
+                              `${t.selector} ${t.width}x${t.height}${t.count > 1 ? ` (x${t.count})` : ""}`,
+                          4,
+                      ),
+        );
+        check(
+            `tap-targets-${MIN_TAP_TARGET_PX}px`,
+            missing.length === 0 && undersized.length === 0,
+            detail.join("; "),
+        );
+    }
+
+    const badRows = facts.rows
+        .map((row) => checkRowLayout(row, viewport.expectStacked))
+        .filter(Boolean);
+    check(
+        viewport.expectStacked ? "host-rows-stacked" : "host-rows-side-by-side",
+        facts.rows.length > 0 && badRows.length === 0,
+        facts.rows.length === 0
+            ? "no host rows were measured"
+            : badRows.length === 0
+              ? `all ${facts.rows.length} rows laid out as expected`
+              : `${badRows.length} of ${facts.rows.length} rows wrong: ` +
+                summarise(badRows, (r) => r),
+    );
+
+    // The mobile early-return path proposed in #8 was rejected: narrow
+    // viewports must keep probing and keep detecting the gateway, not
+    // quietly skip work.
+    check(
+        "probing-still-runs",
+        probes.attempted > 0,
+        `${probes.attempted} outbound probe requests issued`,
+    );
+    check(
+        "gateway-detection-still-runs",
+        facts.gatewayDetected,
+        facts.gatewayDetected
+            ? "Local Gateway row present"
+            : "no Local Gateway row — gateway detection did not run or did not complete",
+    );
+
+    return checks;
+}

test/viewport/facts.js

@@ -0,0 +1,184 @@
+// Layout facts collected from inside the page.
+//
+// This function is serialised and evaluated in the browser, so it must be
+// entirely self-contained: no imports, no closures over module scope. It
+// only *measures*; every pass/fail decision is made back in node by
+// checks.js, so failures can be reported with real numbers attached.
+
+export function collectLayoutFacts(options) {
+    const describe = (el) => {
+        const id = el.id ? "#" + el.id : "";
+        const classes =
+            typeof el.className === "string" && el.className.trim()
+                ? "." + el.className.trim().split(/\s+/).slice(0, 3).join(".")
+                : "";
+        return el.tagName.toLowerCase() + id + classes;
+    };
+
+    const round = (n) => Math.round(n * 10) / 10;
+
+    // Overflow propagates up every ancestor, so a single wide element
+    // reports as body, #app, the row, and so on. Depth lets the report
+    // name the deepest — that is, the actual — offender.
+    const depthOf = (el) => {
+        let depth = 0;
+        for (let node = el.parentElement; node; node = node.parentElement) {
+            depth++;
+        }
+        return depth;
+    };
+
+    const isVisible = (el) => {
+        const style = getComputedStyle(el);
+        if (style.display === "none") return false;
+        if (style.visibility === "hidden") return false;
+        const rect = el.getBoundingClientRect();
+        return rect.width > 0 && rect.height > 0;
+    };
+
+    const innerWidth = window.innerWidth;
+    const clientWidth = document.documentElement.clientWidth;
+    // Under mobile emulation Chrome lets window.innerWidth *grow* to the
+    // width of overflowing content, exactly as a phone zooms out to fit a
+    // too-wide page. Measuring against it would therefore hide the
+    // overflow it is supposed to expose: at a 320px device width a page
+    // that spills to 350 reports innerWidth 350 and looks clean. Every
+    // comparison below is against the layout viewport instead.
+    const viewportWidth = Math.min(innerWidth, clientWidth);
+    const elements = Array.from(document.querySelectorAll("body *"));
+
+    // Elements sticking out past the right (or left) edge of the viewport.
+    // The document-level scrollWidth check says *that* the page overflows;
+    // this says *what* is doing it.
+    const overflowing = [];
+    // Elements clipping their own text. Deliberate ellipsis truncation
+    // (Tailwind's `truncate`) is opt-in and excluded: it is a design
+    // choice, not breakage.
+    const clipped = [];
+    // Elements whose content spills out of their own box without being
+    // clipped, past the right edge of the viewport. A block element is
+    // only ever as wide as its container, so text overflowing it has no
+    // element rect of its own to catch — but it is exactly what drags
+    // documentElement.scrollWidth past the viewport width, so without
+    // this the page-level overflow failure has nothing to point at.
+    const contentOverflowing = [];
+
+    for (const el of elements) {
+        if (!isVisible(el)) continue;
+        const rect = el.getBoundingClientRect();
+        if (rect.right > viewportWidth + 1 || rect.left < -1) {
+            overflowing.push({
+                el: describe(el),
+                depth: depthOf(el),
+                left: round(rect.left),
+                right: round(rect.right),
+            });
+        }
+        const style = getComputedStyle(el);
+        const clips =
+            style.overflowX === "hidden" || style.overflowX === "clip";
+        const ellipsis = style.textOverflow === "ellipsis";
+        const hasText = el.textContent.trim().length > 0;
+        const spills =
+            el.clientWidth > 0 && el.scrollWidth > el.clientWidth + 1;
+        if (clips && !ellipsis && hasText && spills) {
+            clipped.push({
+                el: describe(el),
+                scrollWidth: el.scrollWidth,
+                clientWidth: el.clientWidth,
+            });
+        }
+        if (
+            !clips &&
+            spills &&
+            rect.left + el.scrollWidth > viewportWidth + 1
+        ) {
+            contentOverflowing.push({
+                el: describe(el),
+                depth: depthOf(el),
+                scrollWidth: el.scrollWidth,
+                clientWidth: el.clientWidth,
+                reach: round(rect.left + el.scrollWidth),
+            });
+        }
+    }
+
+    // Interactive controls. The measured target is the nearest thing that
+    // is genuinely tappable — for a checkbox that is the <label> wrapping
+    // it, which is larger than the box itself and is what a finger hits.
+    const tapTargets = [];
+    for (const selector of options.interactiveSelectors) {
+        for (const el of document.querySelectorAll(selector)) {
+            if (!isVisible(el)) continue;
+            const target = el.closest("button, a, label, select") || el;
+            const rect = target.getBoundingClientRect();
+            tapTargets.push({
+                selector,
+                el: describe(target),
+                width: round(rect.width),
+                height: round(rect.height),
+            });
+        }
+    }
+
+    // Host rows. The question is not "did it get narrower" but "did it
+    // reflow": the info block and the sparkline must end up stacked
+    // vertically and full width in the narrow layout, and side by side in
+    // the wide one. Both the computed flex-direction and the actual
+    // geometry are recorded so a row that claims to be a column but is
+    // still laid out side by side cannot slip through.
+    const rows = [];
+    for (const row of document.querySelectorAll(".host-row")) {
+        const inner = row.firstElementChild;
+        if (!inner) continue;
+        const sparkline = inner.querySelector(".sparkline-container");
+        const info = sparkline ? sparkline.previousElementSibling : null;
+        if (!sparkline || !info) continue;
+        const innerStyle = getComputedStyle(inner);
+        const innerRect = inner.getBoundingClientRect();
+        const infoRect = info.getBoundingClientRect();
+        const sparkRect = sparkline.getBoundingClientRect();
+        rows.push({
+            index: row.dataset.index,
+            flexDirection: innerStyle.flexDirection,
+            containerWidth: round(innerRect.width),
+            info: {
+                left: round(infoRect.left),
+                right: round(infoRect.right),
+                bottom: round(infoRect.bottom),
+                width: round(infoRect.width),
+            },
+            sparkline: {
+                left: round(sparkRect.left),
+                top: round(sparkRect.top),
+                width: round(sparkRect.width),
+            },
+        });
+    }
+
+    const localRows = Array.from(
+        document.querySelectorAll("#local-hosts .host-row"),
+    );
+
+    return {
+        innerWidth,
+        // innerWidth includes any classic scrollbar, clientWidth does not.
+        // Reported separately so the overflow check can hold itself to the
+        // narrower of the two rather than to whichever one is more
+        // forgiving.
+        documentClientWidth: document.documentElement.clientWidth,
+        documentScrollWidth: document.documentElement.scrollWidth,
+        overflowing,
+        contentOverflowing,
+        clipped,
+        tapTargets,
+        rows,
+        rowCount: document.querySelectorAll(".host-row").length,
+        numericLatencies: Array.from(
+            document.querySelectorAll(".latency-value"),
+        ).filter((el) => /\d/.test(el.textContent)).length,
+        gatewayDetected: localRows.some((row) =>
+            row.textContent.includes("Local Gateway"),
+        ),
+    };
+}

test/viewport/harness.js

@@ -0,0 +1,258 @@
+// Responsive-layout harness.
+//
+// Drives the built frontend in a real, containerised, digest-pinned Chrome
+// over CDP and asserts on computed layout at every viewport width derived
+// from the app's own CSS. Screenshots are written alongside as artifacts;
+// they are not the evidence, the assertions are.
+//
+// This is not meant to be run by hand. `make frontend-viewport-test` brings
+// up the browser and the web server and then runs this; every input it
+// needs arrives in the environment.
+
+import { mkdirSync, writeFileSync } from "node:fs";
+import { join } from "node:path";
+import puppeteer from "puppeteer-core";
+import { collectLayoutFacts } from "./facts.js";
+import { evaluateChecks, INTERACTIVE_SELECTORS } from "./checks.js";
+import { deriveViewports } from "./viewports.js";
+
+function required(name) {
+    const value = process.env[name];
+    if (!value) {
+        throw new Error(
+            `${name} is not set; run this via script/frontend-viewport-test`,
+        );
+    }
+    return value;
+}
+
+const ROOT = required("NETWATCH_ROOT");
+const BASE_URL = required("NETWATCH_BASE_URL");
+const CDP_URL = required("NETWATCH_CDP_URL");
+const ARTIFACT_DIR = required("NETWATCH_ARTIFACT_DIR");
+
+const BROWSER_TIMEOUT_MS = 60000;
+const PAGE_TIMEOUT_MS = 30000;
+
+// Canned responses for the app's outbound latency probes. The browser
+// container sits on an --internal docker network and physically cannot
+// reach the internet, so nothing here is about blocking traffic; it is
+// about determinism. Real probes would render 24 rows of whatever the
+// network happened to be doing. These delays make the rows show a
+// realistic spread of value widths — one, two and three digit latencies,
+// plus some unreachable rows — because that spread is what the layout has
+// to survive.
+const PROBE_DELAYS_MS = [2, 45, 123, 456, 780];
+// One in every UNREACHABLE_MODULUS probes is failed outright so that the
+// offline row rendering is exercised too.
+const UNREACHABLE_MODULUS = 7;
+// The gateway candidate that "answers", so gateway detection succeeds and
+// the Local Gateway row renders. Matches GATEWAY_CANDIDATES in src/main.js.
+const RESPONSIVE_GATEWAY = "http://192.168.1.1";
+
+const sleep = (ms) => new Promise((resolve) => setTimeout(resolve, ms));
+
+function stableHash(text) {
+    let hash = 0;
+    for (let i = 0; i < text.length; i++) {
+        hash = (hash * 31 + text.charCodeAt(i)) | 0;
+    }
+    return Math.abs(hash);
+}
+
+async function connectBrowser() {
+    const deadline = Date.now() + BROWSER_TIMEOUT_MS;
+    let lastError;
+    for (;;) {
+        try {
+            const response = await fetch(`${CDP_URL}/json/version`);
+            const info = await response.json();
+            // The endpoint advertises whatever Host it was reached on;
+            // pin it back to the address we actually dialled.
+            const endpoint = new URL(info.webSocketDebuggerUrl);
+            endpoint.host = new URL(CDP_URL).host;
+            const browser = await puppeteer.connect({
+                browserWSEndpoint: endpoint.toString(),
+                protocolTimeout: BROWSER_TIMEOUT_MS,
+            });
+            return { browser, version: info.Browser };
+        } catch (error) {
+            lastError = error;
+            if (Date.now() > deadline) {
+                throw new Error(`browser never came up: ${lastError}`);
+            }
+            await sleep(250);
+        }
+    }
+}
+
+function installProbeResponder(page, probes) {
+    const respond = (request, delayMs) =>
+        sleep(delayMs).then(() =>
+            request.respond({
+                status: 200,
+                contentType: "text/plain",
+                body: "",
+            }),
+        );
+
+    page.on("request", (request) => {
+        const url = request.url();
+        const settle = async () => {
+            if (url.startsWith(BASE_URL) || url.startsWith("data:")) {
+                return request.continue();
+            }
+            probes.attempted++;
+            if (url.startsWith(RESPONSIVE_GATEWAY)) {
+                probes.fulfilled++;
+                return respond(request, 5);
+            }
+            const hash = stableHash(url);
+            if (hash % UNREACHABLE_MODULUS === 0) {
+                probes.failed++;
+                return request.abort("connectionfailed");
+            }
+            probes.fulfilled++;
+            return respond(
+                request,
+                PROBE_DELAYS_MS[hash % PROBE_DELAYS_MS.length],
+            );
+        };
+        // The page may be torn down while a delayed response is pending;
+        // that is not a harness failure.
+        settle().catch(() => {});
+    });
+}
+
+async function runViewport(browser, viewport) {
+    const page = await browser.newPage();
+    const probes = { attempted: 0, fulfilled: 0, failed: 0 };
+    try {
+        page.setDefaultTimeout(PAGE_TIMEOUT_MS);
+        await page.setRequestInterception(true);
+        installProbeResponder(page, probes);
+        await page.setViewport({
+            width: viewport.width,
+            height: viewport.height,
+            deviceScaleFactor: viewport.deviceScaleFactor,
+            isMobile: viewport.touch,
+            hasTouch: viewport.touch,
+            isLandscape: viewport.width > viewport.height,
+        });
+
+        await page.goto(BASE_URL, { waitUntil: "load" });
+        await page.waitForSelector(".host-row");
+
+        // The app discards its first tick as a cold start, so rows only
+        // carry real values from the second one. Changing the interval
+        // restarts the loop at 1s, which reaches a populated UI without
+        // waiting out two default 3s intervals — and exercises the
+        // interval dropdown while we are at it.
+        await page.select("#interval-select", "1000");
+        await page.waitForFunction(
+            () =>
+                Array.from(document.querySelectorAll(".latency-value")).filter(
+                    (el) => /\d/.test(el.textContent),
+                ).length >= 5,
+        );
+        // Let the resize/redraw handlers settle before measuring.
+        await page.evaluate(
+            () =>
+                new Promise((resolve) =>
+                    requestAnimationFrame(() => requestAnimationFrame(resolve)),
+                ),
+        );
+
+        const facts = await page.evaluate(collectLayoutFacts, {
+            interactiveSelectors: INTERACTIVE_SELECTORS,
+        });
+
+        const screenshot = join(
+            ARTIFACT_DIR,
+            `${viewport.width}x${viewport.height}-${viewport.name}.png`,
+        );
+        await page.screenshot({ path: screenshot, fullPage: true });
+
+        return {
+            viewport,
+            probes,
+            facts,
+            screenshot,
+            checks: evaluateChecks(facts, viewport, probes),
+        };
+    } finally {
+        await page.close().catch(() => {});
+    }
+}
+
+function report(results, conditions, browserVersion) {
+    const label = (viewport) =>
+        `${viewport.width}x${viewport.height}`.padEnd(9) +
+        " " +
+        viewport.name.padEnd(24);
+
+    console.log(`browser:     ${browserVersion}`);
+    console.log(`served from: ${BASE_URL} (built dist/)`);
+    console.log(
+        "breakpoints: " +
+            conditions
+                .map((c) => `${c.type}-width ${c.px}px (${c.source})`)
+                .join(", "),
+    );
+    console.log("");
+
+    let passed = 0;
+    let failed = 0;
+    for (const result of results) {
+        const bad = result.checks.filter((c) => !c.ok);
+        passed += result.checks.length - bad.length;
+        failed += bad.length;
+        // Passing viewports get one line. Detail is for failures.
+        console.log(
+            `${bad.length === 0 ? "PASS" : "FAIL"} ${label(result.viewport)} ` +
+                `${result.checks.length - bad.length}/${result.checks.length} checks` +
+                `${result.viewport.expectStacked ? "  [narrow layout expected]" : ""}`,
+        );
+        for (const check of bad) {
+            console.log(`       ${check.name}: ${check.detail}`);
+        }
+        if (bad.length > 0) {
+            console.log(`       why this width: ${result.viewport.why}`);
+            console.log(`       screenshot: ${result.screenshot}`);
+        }
+    }
+
+    console.log("");
+    console.log(
+        `${results.length} viewports, ${passed + failed} checks: ` +
+            `${passed} passed, ${failed} failed`,
+    );
+    console.log(`artifacts: ${ARTIFACT_DIR}`);
+    return failed;
+}
+
+async function main() {
+    const { conditions, viewports } = deriveViewports(ROOT);
+    mkdirSync(ARTIFACT_DIR, { recursive: true });
+
+    const { browser, version } = await connectBrowser();
+    const results = [];
+    try {
+        for (const viewport of viewports) {
+            results.push(await runViewport(browser, viewport));
+        }
+    } finally {
+        await browser.disconnect().catch(() => {});
+    }
+
+    writeFileSync(
+        join(ARTIFACT_DIR, "results.json"),
+        JSON.stringify({ browser: version, conditions, results }, null, 2) +
+            "\n",
+    );
+
+    const failed = report(results, conditions, version);
+    process.exitCode = failed === 0 ? 0 : 1;
+}
+
+await main();

test/viewport/viewports.js

@@ -0,0 +1,224 @@
+// Viewport derivation for the responsive-layout harness.
+//
+// The widths tested are read out of the CSS the application actually
+// ships, not taken from a list of popular phone models. A generic 375px
+// "phone" test sails straight past an off-by-one error at a media query
+// boundary, which is the classic way a responsive layout breaks, so
+// every breakpoint found in the sources is probed three times: one pixel
+// below it, exactly on it, and one pixel above it.
+//
+// Nothing here hardcodes 768. If someone adds a second media block or
+// starts using Tailwind responsive prefixes, that breakpoint starts
+// being covered without this file being edited.
+
+import { readFileSync } from "node:fs";
+import { join } from "node:path";
+
+// Tailwind CSS v4 default breakpoints, in rem. The app currently uses
+// none of these prefixes, so the whole table is inert until someone
+// writes an `md:`-prefixed utility class.
+const TAILWIND_BREAKPOINT_REM = {
+    sm: 40,
+    md: 48,
+    lg: 64,
+    xl: 80,
+    "2xl": 96,
+};
+
+// The app does not override the root font size, so rem and em in media
+// queries resolve against the browser default.
+const ROOT_FONT_SIZE_PX = 16;
+
+// Extract every min-width / max-width condition from the @media blocks in
+// a stylesheet. Returns e.g. [{ type: "max", px: 768, source: "..." }].
+export function mediaConditionsFromCss(css, source) {
+    const conditions = [];
+    for (const block of css.matchAll(/@media([^{]+)\{/g)) {
+        const features = block[1].matchAll(
+            /\(\s*(min|max)-width\s*:\s*([\d.]+)(px|rem|em)\s*\)/g,
+        );
+        for (const feature of features) {
+            const scale = feature[3] === "px" ? 1 : ROOT_FONT_SIZE_PX;
+            conditions.push({
+                type: feature[1],
+                px: Math.round(Number(feature[2]) * scale),
+                source,
+            });
+        }
+    }
+    return conditions;
+}
+
+// Extract the breakpoints implied by Tailwind responsive prefixes used in
+// markup. A prefix only counts when it opens a utility class, so `text-sm`
+// does not masquerade as the `sm:` breakpoint.
+export function mediaConditionsFromMarkup(sources) {
+    const conditions = [];
+    for (const { path, text } of sources) {
+        for (const [name, rem] of Object.entries(TAILWIND_BREAKPOINT_REM)) {
+            const used = new RegExp(
+                `(^|["'\\s])${name}:[a-z0-9[\\](),_./%-]+`,
+                "m",
+            ).test(text);
+            if (used) {
+                conditions.push({
+                    type: "min",
+                    px: rem * ROOT_FONT_SIZE_PX,
+                    source: path,
+                });
+            }
+        }
+    }
+    return conditions;
+}
+
+// Whether a given width should be rendering the app's narrow (stacked)
+// layout.
+//
+// Two breakpoint styles can be answered from the condition list alone:
+//
+//   - Desktop-first, which is what the app ships today: the wide layout is
+//     unconditional and every narrow rule lives in a `max-width` block, so
+//     a width is narrow exactly when one of those blocks matches. Note that
+//     `max-width: 768px` matches *at* 768 — getting this inclusive boundary
+//     wrong in either direction is what the three-widths-per-breakpoint
+//     sweep exists to catch.
+//   - Mobile-first, which is what Tailwind's `sm:`/`md:` prefixes are: the
+//     stacked layout is the unconditional base and a `min-width` block is
+//     what widens it, so a width is narrow exactly when it sits below every
+//     `min-width` breakpoint.
+//
+// A mix of the two cannot be resolved from the breakpoints alone — which
+// block owns the host-row reflow is a property of the rules inside it, not
+// of the condition — so this throws rather than guessing. Guessing is how
+// the wrong expectation gets applied at the right widths and the whole
+// sweep quietly verifies nothing.
+export function expectsStackedLayout(width, conditions) {
+    const kinds = new Set(conditions.map((c) => c.type));
+    for (const kind of kinds) {
+        if (kind !== "max" && kind !== "min") {
+            throw new Error(
+                `unsupported media condition type "${kind}" in ` +
+                    "expectsStackedLayout (test/viewport/viewports.js)",
+            );
+        }
+    }
+    if (kinds.has("max") && kinds.has("min")) {
+        throw new Error(
+            "the app now mixes max-width and min-width breakpoints (" +
+                conditions
+                    .map((c) => `${c.type}-width ${c.px}px in ${c.source}`)
+                    .join(", ") +
+                "), so which layout a width should be showing can no longer " +
+                "be inferred from the breakpoint list; teach " +
+                "expectsStackedLayout in test/viewport/viewports.js which " +
+                "block owns the host-row reflow",
+        );
+    }
+    if (kinds.has("min")) {
+        return !conditions.some((c) => width >= c.px);
+    }
+    return conditions.some((c) => width <= c.px);
+}
+
+// Viewports that are not derived from a breakpoint. Each one is here for
+// a stated reason; none of them is a stand-in for "a phone".
+const ANCHOR_VIEWPORTS = [
+    {
+        name: "floor-portrait",
+        width: 320,
+        height: 568,
+        deviceScaleFactor: 2,
+        touch: true,
+        why: "320px is the narrowest viewport still in mainstream use; nothing has to work below it",
+    },
+    {
+        name: "phone-landscape-narrow",
+        width: 667,
+        height: 375,
+        deviceScaleFactor: 2,
+        touch: true,
+        why: "phone rotated to landscape, still inside the narrow layout",
+    },
+    {
+        name: "phone-landscape-wide",
+        width: 844,
+        height: 390,
+        deviceScaleFactor: 3,
+        touch: true,
+        why: "large phone rotated to landscape: crosses into the wide layout while still being a touch device",
+    },
+    {
+        name: "desktop",
+        width: 1280,
+        height: 800,
+        deviceScaleFactor: 1,
+        touch: false,
+        why: "desktop baseline",
+    },
+];
+
+export function deriveViewports(root) {
+    const conditions = [
+        ...mediaConditionsFromCss(
+            readFileSync(join(root, "src/styles.css"), "utf8"),
+            "src/styles.css",
+        ),
+        ...mediaConditionsFromMarkup([
+            {
+                path: "src/main.js",
+                text: readFileSync(join(root, "src/main.js"), "utf8"),
+            },
+            {
+                path: "index.html",
+                text: readFileSync(join(root, "index.html"), "utf8"),
+            },
+        ]),
+    ];
+
+    if (conditions.length === 0) {
+        throw new Error(
+            "no responsive breakpoints found in src/styles.css, src/main.js or " +
+                "index.html — either the responsive layout was deleted or this " +
+                "derivation has stopped matching the sources",
+        );
+    }
+
+    const viewports = new Map();
+    const add = (viewport) => {
+        const key = `${viewport.width}x${viewport.height}`;
+        if (!viewports.has(key)) viewports.set(key, viewport);
+    };
+
+    for (const condition of conditions) {
+        for (const [offset, label] of [
+            [-1, "below"],
+            [0, "at"],
+            [+1, "above"],
+        ]) {
+            const width = condition.px + offset;
+            add({
+                name: `${condition.type}-width-${condition.px}-${label}`,
+                width,
+                // Tall enough that the whole app is laid out in one column
+                // without the viewport height influencing wrapping.
+                height: 1024,
+                deviceScaleFactor: 2,
+                touch: true,
+                why: `${offset === 0 ? "exactly on" : `1px ${label}`} the ${condition.type}-width: ${condition.px}px breakpoint declared in ${condition.source}`,
+            });
+        }
+    }
+
+    for (const anchor of ANCHOR_VIEWPORTS) add(anchor);
+
+    return {
+        conditions,
+        viewports: [...viewports.values()]
+            .map((viewport) => ({
+                ...viewport,
+                expectStacked: expectsStackedLayout(viewport.width, conditions),
+            }))
+            .sort((a, b) => a.width - b.width || a.height - b.height),
+    };
+}

yarn.lock

@@ -197,6 +197,14 @@
     "@emnapi/runtime" "^1.7.1"
     "@tybys/wasm-util" "^0.10.1"
 
+"@puppeteer/browsers@3.1.0":
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/@puppeteer/browsers/-/browsers-3.1.0.tgz#5728ae0bc649263133ac1f8bd5d360eb75d11748"
+  integrity sha512-RDLpio3fH/qrj5k4DVY6eyiN8tCS0Zovd/6jW//n605oeqkWcUjn+3k+9ZtZBnbwMpsu0F7xDIiKXvVmG5c5Bw==
+  dependencies:
+    modern-tar "^0.7.6"
+    yargs "^18.0.0"
+
 "@rollup/rollup-android-arm-eabi@4.57.0":
   version "4.57.0"
   resolved "https://registry.yarnpkg.com/@rollup/rollup-android-arm-eabi/-/rollup-android-arm-eabi-4.57.0.tgz#f762035679a6b168138c94c960fda0b0cdb00d98"
@@ -441,6 +449,16 @@
   resolved "https://registry.yarnpkg.com/@types/estree/-/estree-1.0.8.tgz#958b91c991b1867ced318bedea0e215ee050726e"
   integrity sha512-dWHzHa2WqEXI/O1E9OjrocMTKJl2mSrEolh1Iomrv6U+JuNwaHXsXx9bLu5gG7BUWFIN0skIQJQ/L1rIex4X6w==
 
+ansi-regex@^6.2.2:
+  version "6.2.2"
+  resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-6.2.2.tgz#60216eea464d864597ce2832000738a0589650c1"
+  integrity sha512-Bq3SmSpyFHaWjPk8If9yc6svM8c56dB5BAtW4Qbw5jHTwwXXcTLoRMkpDJp6VL0XzlWaCHTXrkFURMYmD0sLqg==
+
+ansi-styles@^6.2.1:
+  version "6.2.3"
+  resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-6.2.3.tgz#c044d5dcc521a076413472597a1acb1f103c4041"
+  integrity sha512-4Dj6M28JB+oAH8kFkTLUo+a2jwOFkuqb3yucU0CANcRRUbxS0cP0nZYCGjcc3BNXwRIsUVmDGgzawme7zvJHvg==
+
 autoprefixer@^10.4.23:
   version "10.4.23"
   resolved "https://registry.yarnpkg.com/autoprefixer/-/autoprefixer-10.4.23.tgz#c6aa6db8e7376fcd900f9fd79d143ceebad8c4e6"
@@ -473,16 +491,43 @@ caniuse-lite@^1.0.30001759, caniuse-lite@^1.0.30001760:
   resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30001766.tgz#b6f6b55cb25a2d888d9393104d14751c6a7d6f7a"
   integrity sha512-4C0lfJ0/YPjJQHagaE9x2Elb69CIqEPZeG0anQt9SIvIoOH4a4uaRl73IavyO+0qZh6MDLH//DrXThEYKHkmYA==
 
+chromium-bidi@17.0.2:
+  version "17.0.2"
+  resolved "https://registry.yarnpkg.com/chromium-bidi/-/chromium-bidi-17.0.2.tgz#921a586deecd0c2d8b9242c4c1b73c3aa39ff77c"
+  integrity sha512-5v9GQFhTktFvotn/OFNJBmKLKRAb6n9r0bVCwf7sHgWc3/JryK0bj1nn93L3pHFrfgcsu6Be6EWsDi+1XHTGDg==
+  dependencies:
+    mitt "^3.0.1"
+    zod "^3.24.1"
+
+cliui@^9.0.1:
+  version "9.0.1"
+  resolved "https://registry.yarnpkg.com/cliui/-/cliui-9.0.1.tgz#6f7890f386f6f1f79953adc1f78dec46fcc2d291"
+  integrity sha512-k7ndgKhwoQveBL+/1tqGJYNz097I7WOvwbmmU2AR5+magtbjPWQTS1C5vzGkBC8Ym8UWRzfKUzUUqFLypY4Q+w==
+  dependencies:
+    string-width "^7.2.0"
+    strip-ansi "^7.1.0"
+    wrap-ansi "^9.0.0"
+
 detect-libc@^2.0.3:
   version "2.1.2"
   resolved "https://registry.yarnpkg.com/detect-libc/-/detect-libc-2.1.2.tgz#689c5dcdc1900ef5583a4cb9f6d7b473742074ad"
   integrity sha512-Btj2BOOO83o3WyH59e8MgXsxEQVcarkUOpEYrubB0urwnN10yQ364rsiByU11nZlqWYZm05i/of7io4mzihBtQ==
 
+devtools-protocol@0.0.1653615:
+  version "0.0.1653615"
+  resolved "https://registry.yarnpkg.com/devtools-protocol/-/devtools-protocol-0.0.1653615.tgz#c600e0c619612156b2422a66d958ba188d87dbe8"
+  integrity sha512-pGVkY3T/qXxAp2nFPodwYqOevk6ncNMSmvL8QfRCx5ZWGd6Vor7AFNmyaA8Zs6uJyP1QAfjuLandCgvSix1BNA==
+
 electron-to-chromium@^1.5.263:
   version "1.5.282"
   resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.5.282.tgz#6695816e5b170210d6aa07561546ed7d97347630"
   integrity sha512-FCPkJtpst28UmFzd903iU7PdeVTfY0KAeJy+Lk0GLZRwgwYHn/irRcaCbQQOmr5Vytc/7rcavsYLvTM8RiHYhQ==
 
+emoji-regex@^10.3.0:
+  version "10.6.0"
+  resolved "https://registry.yarnpkg.com/emoji-regex/-/emoji-regex-10.6.0.tgz#bf3d6e8f7f8fd22a65d9703475bc0147357a6b0d"
+  integrity sha512-toUI84YS5YmxW219erniWD0CIVOo46xGKColeNQRgOzDorgBi1v4D71/OFzgD9GO2UGKIv1C3Sp8DAn0+j5w7A==
+
 enhanced-resolve@^5.18.3:
   version "5.18.4"
   resolved "https://registry.yarnpkg.com/enhanced-resolve/-/enhanced-resolve-5.18.4.tgz#c22d33055f3952035ce6a144ce092447c525f828"
@@ -523,7 +568,7 @@ esbuild@^0.27.0:
     "@esbuild/win32-ia32" "0.27.2"
     "@esbuild/win32-x64" "0.27.2"
 
-escalade@^3.2.0:
+escalade@^3.1.1, escalade@^3.2.0:
   version "3.2.0"
   resolved "https://registry.yarnpkg.com/escalade/-/escalade-3.2.0.tgz#011a3f69856ba189dffa7dc8fcce99d2a87903e5"
   integrity sha512-WUj2qlxaQtO4g6Pq5c29GTcWGDyd8itL8zTlipgECz3JesAiiOKotd8JU6otB3PACgG6xkJUyVhboMS+bje/jA==
@@ -543,6 +588,16 @@ fsevents@~2.3.2, fsevents@~2.3.3:
   resolved "https://registry.yarnpkg.com/fsevents/-/fsevents-2.3.3.tgz#cac6407785d03675a2a5e1a5305c697b347d90d6"
   integrity sha512-5xoDfX+fL7faATnagmWPpbFtwh/R77WmMMqqHGS65C3vvB0YHrgF+B1YmZ3441tMj5n63k0212XNoJwzlhffQw==
 
+get-caller-file@^2.0.5:
+  version "2.0.5"
+  resolved "https://registry.yarnpkg.com/get-caller-file/-/get-caller-file-2.0.5.tgz#4f94412a82db32f36e3b0b9741f8a97feb031f7e"
+  integrity sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg==
+
+get-east-asian-width@^1.0.0, get-east-asian-width@^1.5.0:
+  version "1.6.0"
+  resolved "https://registry.yarnpkg.com/get-east-asian-width/-/get-east-asian-width-1.6.0.tgz#216900f91df11a8b2c198c3e1d93d6c035a776b9"
+  integrity sha512-QRbvDIbx6YklUe6RxeTeleMR0yv3cYH6PsPZHcnVn7xv7zO1BHN8r0XETu8n6Ye3Q+ahtSarc3WgtNWmehIBfA==
+
 graceful-fs@^4.2.4:
   version "4.2.11"
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.11.tgz#4183e4e8bf08bb6e05bbb2f7d2e0c8f712ca40e3"
@@ -634,6 +689,16 @@ magic-string@^0.30.21:
   dependencies:
     "@jridgewell/sourcemap-codec" "^1.5.5"
 
+mitt@^3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/mitt/-/mitt-3.0.1.tgz#ea36cf0cc30403601ae074c8f77b7092cdab36d1"
+  integrity sha512-vKivATfr97l2/QBCYAkXYDbrIWPM2IIKEl7YPhjCvKlG3kE2gm+uBo6nEXK3M5/Ffh/FLpKExzOQ3JJoJGFKBw==
+
+modern-tar@^0.7.6:
+  version "0.7.7"
+  resolved "https://registry.yarnpkg.com/modern-tar/-/modern-tar-0.7.7.tgz#ca71d79603630076b10733b0751ccab284bbc1ef"
+  integrity sha512-t9VmxaqrmANnEOBhpSDI6HD192Ge48k8vmWqQQL7hSFEqHEYwZbbsu49+aKLWZeRvFs3j1pMhXOqqF4kPlvjkQ==
+
 nanoid@^3.3.11:
   version "3.3.11"
   resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.3.11.tgz#4f4f112cefbe303202f2199838128936266d185b"
@@ -673,6 +738,18 @@ prettier@^3.8.1:
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-3.8.1.tgz#edf48977cf991558f4fcbd8a3ba6015ba2a3a173"
   integrity sha512-UOnG6LftzbdaHZcKoPFtOcCKztrQ57WkHDeRD9t/PTQtmT0NHSeWWepj6pS0z/N7+08BHFDQVUrfmfMRcZwbMg==
 
+puppeteer-core@25.5.0:
+  version "25.5.0"
+  resolved "https://registry.yarnpkg.com/puppeteer-core/-/puppeteer-core-25.5.0.tgz#a41b14d582056b998e0bc3561ac47c7615d38a53"
+  integrity sha512-XPNT0dQJtphqQ4I29zxlG4IIPbg1iEHAQKWuQgtMJGXjACV77pZSmJvDi51IIIfd+DTKICcopJwUx4upVQ4XbA==
+  dependencies:
+    "@puppeteer/browsers" "3.1.0"
+    chromium-bidi "17.0.2"
+    devtools-protocol "0.0.1653615"
+    typed-query-selector "^2.12.2"
+    webdriver-bidi-protocol "0.4.2"
+    ws "^8.21.1"
+
 rollup@^4.43.0:
   version "4.57.0"
   resolved "https://registry.yarnpkg.com/rollup/-/rollup-4.57.0.tgz#9fa13c1fb779d480038f45708b5e01b9449b6853"
@@ -712,6 +789,30 @@ source-map-js@^1.2.1:
   resolved "https://registry.yarnpkg.com/source-map-js/-/source-map-js-1.2.1.tgz#1ce5650fddd87abc099eda37dcff024c2667ae46"
   integrity sha512-UXWMKhLOwVKb728IUtQPXxfYU+usdybtUrK/8uGE8CQMvrhOpwvzDBwj0QhSL7MQc7vIsISBG8VQ8+IDQxpfQA==
 
+string-width@^7.0.0, string-width@^7.2.0:
+  version "7.2.0"
+  resolved "https://registry.yarnpkg.com/string-width/-/string-width-7.2.0.tgz#b5bb8e2165ce275d4d43476dd2700ad9091db6dc"
+  integrity sha512-tsaTIkKW9b4N+AEj+SVA+WhJzV7/zMhcSu78mLKWSk7cXMOSHsBKFWUs0fWwq8QyK3MgJBQRX6Gbi4kYbdvGkQ==
+  dependencies:
+    emoji-regex "^10.3.0"
+    get-east-asian-width "^1.0.0"
+    strip-ansi "^7.1.0"
+
+string-width@^8.2.1:
+  version "8.2.2"
+  resolved "https://registry.yarnpkg.com/string-width/-/string-width-8.2.2.tgz#7310516493df575742fe98af6fae87d85d5ed0ac"
+  integrity sha512-GaPUh5gfdrYzqeVNZvUfT23vYYxXzKYidUcnMtJg/3rxRV63EFZy3k6xfKlmfeJD0176lnUV/Usr3XcwSvFzpg==
+  dependencies:
+    get-east-asian-width "^1.5.0"
+    strip-ansi "^7.1.2"
+
+strip-ansi@^7.1.0, strip-ansi@^7.1.2:
+  version "7.2.0"
+  resolved "https://registry.yarnpkg.com/strip-ansi/-/strip-ansi-7.2.0.tgz#d22a269522836a627af8d04b5c3fd2c7fa3e32e3"
+  integrity sha512-yDPMNjp4WyfYBkHnjIRLfca1i6KMyGCtsVgoKe/z1+6vukgaENdgGBZt+ZmKPc4gavvEZ5OgHfHdrazhgNyG7w==
+  dependencies:
+    ansi-regex "^6.2.2"
+
 tailwindcss@4.1.18, tailwindcss@^4.1.18:
   version "4.1.18"
   resolved "https://registry.yarnpkg.com/tailwindcss/-/tailwindcss-4.1.18.tgz#f488ba47853abdb5354daf9679d3e7791fc4f4e3"
@@ -735,6 +836,11 @@ tslib@^2.4.0:
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.8.1.tgz#612efe4ed235d567e8aba5f2a5fab70280ade83f"
   integrity sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==
 
+typed-query-selector@^2.12.2:
+  version "2.12.2"
+  resolved "https://registry.yarnpkg.com/typed-query-selector/-/typed-query-selector-2.12.2.tgz#65e2462ac6b0aecfae1bfac1a4f3027070dbabaa"
+  integrity sha512-EOPFbyIub4ngnEdqi2yOcNeDLaX/0jcE1JoAXQDDMIthap7FoN795lc/SHfIq2d416VufXpM8z/lD+WRm2gfOQ==
+
 update-browserslist-db@^1.2.0:
   version "1.2.3"
   resolved "https://registry.yarnpkg.com/update-browserslist-db/-/update-browserslist-db-1.2.3.tgz#64d76db58713136acbeb4c49114366cc6cc2e80d"
@@ -756,3 +862,49 @@ vite@^7.3.1:
     tinyglobby "^0.2.15"
   optionalDependencies:
     fsevents "~2.3.3"
+
+webdriver-bidi-protocol@0.4.2:
+  version "0.4.2"
+  resolved "https://registry.yarnpkg.com/webdriver-bidi-protocol/-/webdriver-bidi-protocol-0.4.2.tgz#f51bb71c2606e90e3d5727607c728b25d617b58b"
+  integrity sha512-VSV+fzfChirL3e7jay2yUC7B4HQCGtEWEg/MSSQbK+qWbqeGlRLlXTzPpYr3XGUvbpDHumWZBJxgesg4N7dbtA==
+
+wrap-ansi@^9.0.0:
+  version "9.0.2"
+  resolved "https://registry.yarnpkg.com/wrap-ansi/-/wrap-ansi-9.0.2.tgz#956832dea9494306e6d209eb871643bb873d7c98"
+  integrity sha512-42AtmgqjV+X1VpdOfyTGOYRi0/zsoLqtXQckTmqTeybT+BDIbM/Guxo7x3pE2vtpr1ok6xRqM9OpBe+Jyoqyww==
+  dependencies:
+    ansi-styles "^6.2.1"
+    string-width "^7.0.0"
+    strip-ansi "^7.1.0"
+
+ws@^8.21.1:
+  version "8.21.3"
+  resolved "https://registry.yarnpkg.com/ws/-/ws-8.21.3.tgz#660b4faddb6a3e575c86e078126919961f4de4fc"
+  integrity sha512-201TZ/kPWxoPr/OKWjquZR1SWKXcvxdH+e1xrx89b3YbmzLMFCLfnaG1HFIgWzJOEWZ7MvpK++odZufgYR50Rw==
+
+y18n@^5.0.5:
+  version "5.0.8"
+  resolved "https://registry.yarnpkg.com/y18n/-/y18n-5.0.8.tgz#7f4934d0f7ca8c56f95314939ddcd2dd91ce1d55"
+  integrity sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==
+
+yargs-parser@^22.0.0:
+  version "22.0.0"
+  resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-22.0.0.tgz#87b82094051b0567717346ecd00fd14804b357c8"
+  integrity sha512-rwu/ClNdSMpkSrUb+d6BRsSkLUq1fmfsY6TOpYzTwvwkg1/NRG85KBy3kq++A8LKQwX6lsu+aWad+2khvuXrqw==
+
+yargs@^18.0.0:
+  version "18.1.0"
+  resolved "https://registry.yarnpkg.com/yargs/-/yargs-18.1.0.tgz#cd7e98c703ef51695bbbf062ed58f28e94291b56"
+  integrity sha512-2rAgRKu54VsHkqI0/tYkmluGXHD4KW7yZoycuqDQ15QOTnc2VVfy0nN/1eMhnQLO00A+dwtK20xuCnc1YGeUyg==
+  dependencies:
+    cliui "^9.0.1"
+    escalade "^3.1.1"
+    get-caller-file "^2.0.5"
+    string-width "^8.2.1"
+    y18n "^5.0.5"
+    yargs-parser "^22.0.0"
+
+zod@^3.24.1:
+  version "3.25.76"
+  resolved "https://registry.yarnpkg.com/zod/-/zod-3.25.76.tgz#26841c3f6fd22a6a2760e7ccb719179768471e34"
+  integrity sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==