fix: run libsodium on WebAssembly under the extension CSP (closes #182)

libsodium ships a WASM build and a wasm2js translation in one file, tries
WASM first, and silently falls back if instantiation throws. Under a plain
script-src 'self' the fallback was taken on every popup load, announced by
nothing but an uncaught CompileError.

Measured on the vault's own Argon2id parameters (OPSLIMIT_INTERACTIVE,
MEMLIMIT_INTERACTIVE), node 22: WASM 141-198ms per derivation, wasm2js
3204-3660ms. The work factor is identical either way — it is set by the
ops and memory parameters, not by wall time — so the fallback bought no
security and cost about 3.5s on every operation that asks for the
password, which is every signature.

Both manifests now declare script-src 'self' 'wasm-unsafe-eval';
object-src 'self' for extension pages: an object under
content_security_policy.extension_pages for Chrome MV3, a bare string for
Firefox MV2. The keyword permits compiling WebAssembly and nothing else —
not eval() of strings, not inline script, not remote script — and reaching
it requires already executing script in an extension page. 'unsafe-eval'
is not granted.

The silence is what made this dangerous, so the fallback is now loud at
three levels: tests/manifest.test.js pins both policies to exactly that
token set, failing make check if the grant is dropped or if anything is
added beside it; tests/vaultBackend.test.js asserts the unit tests
exercise the WASM backend, with a self-validating check that libsodium
never swapped its fallback in; and the e2e suite compiles a WebAssembly
module inside the real popup under the real manifest, with the harness
allowlist entry that used to excuse the CompileError now deleted.

The runtime fallback itself is kept — a wallet that refuses to decrypt is
worse than a slow one — but vault.js now reports the backend and logs an
error when it is not WASM.

.dockerignore

@@ -1,3 +1,6 @@
+# .git is deliberately NOT excluded: build.js shells out to `git rev-parse` for
+# build-info stamping and the Dockerfile runs `make build`, so excluding it
+# would make every built extension report commitHash "unknown".
 node_modules
 .DS_Store
 dist

Makefile

@@ -11,7 +11,7 @@ setup:
 	@script/setup
 
 install:
-	@yarn install
+	@yarn install --frozen-lockfile
 
 test:
 	@script/test

README.md

@@ -31,10 +31,13 @@ list exists to detect symbol spoofing attacks and improve UX.
 ```bash
 git clone https://git.eeqj.de/sneak/autistmask.git
 cd autistmask
-make install
+make setup
 make build
 ```
 
+`make setup` is the entrypoint for a fresh clone: it installs dependencies from
+the lockfile and installs the git pre-commit hook.
+
 Load the extension:
 
 - **Chrome**: Navigate to `chrome://extensions/`, enable "Developer mode", click
@@ -97,6 +100,19 @@ provide:
 - `script/precommit` — run by the git pre-commit hook; runs `script/check`
 - `script/install-precommit` — install the git pre-commit hook
 
+The Makefile shims to those. It also carries a few targets that have no
+`script/` counterpart and are Makefile-only conveniences:
+
+- `make install` — `yarn install --frozen-lockfile` on its own, without the rest
+  of `script/bootstrap`. Frozen so a stale `yarn.lock` fails instead of being
+  silently rewritten. Use `make setup` for a fresh clone.
+- `make hooks` — shims to `script/install-precommit`
+- `make build` — build the extension into `dist/chrome/` and `dist/firefox/`
+- `make build-debug` — the same build with `AUTISTMASK_DEBUG=1` (see
+  [Debug Builds](#debug-builds))
+- `make clean` — remove `dist/`
+- `make dev` — build in watch mode
+
 ## End-to-End Tests
 
 `make test-e2e` builds `dist/chrome/` and drives the **real popup in a real

TODO.md

@@ -49,6 +49,16 @@ undefined identifiers, which is how
   fallback at 20x the Argon2id cost, pinned in both directions by
   `tests/manifest.test.js` and observed in the real popup by the e2e suite
   ([#182](https://git.eeqj.de/sneak/AutistMask/issues/182)).
+- 2026-08-11: Policy compliance sweep — conditional verbose test rerun, local
+  Tailwind binary instead of `npx`, `--frozen-lockfile` on `make install`, and
+  the Makefile-only targets documented in the README
+  ([#166](https://git.eeqj.de/sneak/AutistMask/issues/166)).
+- 2026-08-11: `script/verify-build` diagnostics corrected: the both-markers
+  message now states what is and is not proven, an unreadable bundle is
+  diagnosed as an I/O fault rather than as changed output, the `*.js` assumption
+  lives only in `build.js`, and the unlisted-bundle scan hard-fails when it
+  cannot enumerate `dist/`
+  ([#180](https://git.eeqj.de/sneak/AutistMask/issues/180)).
 - 2026-08-11: Three `README.md` claims corrected against the code — blocklist
   attribution, token-display rule, navigation model
   ([#213](https://git.eeqj.de/sneak/AutistMask/issues/213)).
@@ -58,10 +68,18 @@ undefined identifiers, which is how
 - 2026-08-11: `docs/README.md` rewritten against the code: no competitor names,
   all five network destinations documented, password/Settings/Add Wallet
   sections corrected ([#163](https://git.eeqj.de/sneak/AutistMask/issues/163)).
+- 2026-08-11: `loadState()` now derives `hasWallet` from the wallet list instead
+  of trusting the persisted flag, so a profile already saved inconsistent no
+  longer stays broken on every load
+  ([#195](https://git.eeqj.de/sneak/AutistMask/issues/195)).
 - 2026-08-11: Wallet deletion repairs its own state — `hasWallet` follows the
   remaining wallets, the selection only moves when it was deleted, and the
   active-address change is broadcast to connected sites
   ([#156](https://git.eeqj.de/sneak/AutistMask/issues/156)).
+- 2026-08-11: One row per on-chain value movement in transaction history: the
+  merge moved into the pure `mergeTransactions` and the zero-ETH native side of
+  a plain ERC-20 transfer absorbed into its token row
+  ([#177](https://git.eeqj.de/sneak/AutistMask/issues/177)).
 - 2026-08-11: `TODO.md` Workflow rewritten to the branch-and-PR-per-issue model
   on `next`, with Status and Next Step refreshed
   ([#191](https://git.eeqj.de/sneak/AutistMask/issues/191)).

build.js

@@ -29,6 +29,12 @@ function repoRelative(p) {
 // reports every input that contributed to an output in the metafile, which is
 // the authoritative answer to "is constants.js in this bundle" — unlike
 // searching the minified text, it does not depend on what survived minification.
+//
+// The ".js" filter below is the only place that assumption lives:
+// script/verify-build searches every file and symlink under dist/ for a
+// marker, without filtering by extension, and hard-fails if it cannot walk the
+// whole tree, so a bundle emitted under some other extension fails there as
+// unlisted rather than escaping both checks at once.
 function outputsContainingAuditedModule(metafile) {
     return Object.entries(metafile.outputs)
         .filter(([outFile, info]) => {
@@ -115,8 +121,17 @@ async function build() {
     // build that never gets around to writing one cannot be verified against
     // a stale list.
     fs.rmSync(BUNDLE_MANIFEST, { force: true });
+    // The locally installed binary, not `npx` — npx silently fetches from the
+    // registry when the binary is absent, which is an unpinned network fetch
+    // in the middle of a build.
+    const tailwindBin = path.join(
+        __dirname,
+        "node_modules",
+        ".bin",
+        "tailwindcss",
+    );
     execSync(
-        `npx @tailwindcss/cli -i ${tailwindInput} -o ${tailwindOutput} --minify`,
+        `"${tailwindBin}" -i "${tailwindInput}" -o "${tailwindOutput}" --minify`,
         { stdio: "inherit" },
     );
 

package.json

@@ -7,6 +7,7 @@
     "private": true,
     "scripts": {
         "test": "jest --forceExit",
+        "test:verbose": "jest --forceExit --verbose",
         "build": "node build.js",
         "lint": "prettier --check .",
         "fmt": "prettier --write .",

script/test

@@ -7,7 +7,13 @@ ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"
 main() {
     cd "$ROOT"
     echo "Running tests..."
-    timeout 30 yarn run test 2>&1
+    timeout 30 yarn run test 2>&1 || {
+        echo "--- Rerunning with --verbose for details ---"
+        timeout 30 yarn run test:verbose 2>&1 || true
+        # Always fail: the first run already proved the tests are broken, so a
+        # flaky pass on the rerun must not turn the build green.
+        exit 1
+    }
 }
 
 main "$@"

script/verify-build

@@ -34,16 +34,51 @@ fail() {
     exit 1
 }
 
+# Is the literal $1 present in the file $2? Match (grep exit 0) and no-match
+# (exit 1) are answers about the emitted output. Anything else (exit 2: the
+# file could not be read) is not an answer at all, and must not be reported as
+# "no marker" — that would blame the bundle for a permissions or I/O fault.
 has_marker() {
-    grep -q -F "$1" "$2" 2>/dev/null
+    _hm_status=0
+    grep -q -F -e "$1" -- "$2" || _hm_status=$?
+    case "$_hm_status" in
+    0) return 0 ;;
+    1) return 1 ;;
+    *)
+        fail "grep exited $_hm_status reading $2, so the file could not be
+    searched and its DEBUG state was not checked at all. That is a permissions
+    or I/O fault on the artifact, not a change in the emitted output. Refusing
+    to report success."
+        ;;
+    esac
+}
+
+# Does the manifest list the path $1, as a whole line? Same discipline as
+# has_marker: exit 0 and 1 are answers about the manifest, exit 2 means the
+# manifest could not be read and is not an answer at all. Without this, an
+# unreadable manifest reads as "this file is not listed" and every emitted
+# bundle gets reported as an unlisted one.
+is_listed() {
+    _il_status=0
+    grep -q -x -F -e "$1" -- "$MANIFEST" || _il_status=$?
+    case "$_il_status" in
+    0) return 0 ;;
+    1) return 1 ;;
+    *)
+        fail "grep exited $_il_status reading $MANIFEST, so it could not be
+    searched and nothing was established about which bundles it lists. That is
+    a permissions or I/O fault on the manifest, not a stale manifest. Refusing
+    to report success."
+        ;;
+    esac
 }
 
 # Read one bundle's DEBUG state into MARKER. Exactly one marker must be
 # present. Both means the ternary in constants.js was never folded, which is
 # what happens when the __BUILD_DEBUG__ define goes missing from build.js:
-# DEBUG stops being known at build time and the debug branch is live again.
+# DEBUG stops being known at build time. Neither means we are reading output
-# Neither means we are reading output we do not understand. Both are hard
+# we do not understand. Both are hard failures; neither is ever treated as
-# failures; neither is ever treated as absence of a problem.
+# absence of a problem.
 read_marker() {
     _file="$1"
     _on=no
@@ -52,9 +87,14 @@ read_marker() {
     if has_marker "$MARKER_OFF" "$_file"; then _off=yes; fi
 
     if [ "$_on" = yes ] && [ "$_off" = yes ]; then
-        fail "$_file carries both debug markers, so the build-time DEBUG value
+        fail "$_file carries both debug markers, so DEBUG was not resolved at
-    was never resolved and the debug branch is still live. Check that build.js
+    build time: the ternary in src/shared/constants.js survived into the
-    still defines __BUILD_DEBUG__."
+    emitted output. This does not mean the debug branch is live in this
+    artifact: an unresolved __BUILD_DEBUG__ is undeclared in extension
+    context, so DEBUG evaluates to false at runtime. It does mean the
+    release/debug distinction is no longer enforced at build time, and which
+    way that fallback happens to evaluate is then an accident a refactor can
+    flip. Check that build.js still defines __BUILD_DEBUG__."
     fi
     if [ "$_on" = no ] && [ "$_off" = no ]; then
         fail "$_file carries no debug marker, so its DEBUG state cannot be
@@ -70,13 +110,43 @@ read_marker() {
 }
 
 # The manifest says which bundles must carry a marker. This says no other
-# emitted bundle may carry one, which catches a manifest that has gone stale
+# emitted file may carry one, which catches a manifest that has gone stale
 # or short rather than trusting whatever it happens to list.
+#
+# Deliberately unfiltered by extension. build.js selects manifest entries with
+# an endsWith(".js") test; repeating that literal here would mean a bundle
+# emitted under some other extension escaped the manifest AND this check at
+# once, which is the correlated blind spot the two-source design exists to
+# avoid. Every file under dist/ is searched, so build.js's filter is the only
+# place the assumption lives and this check is what catches it being wrong.
+#
+# That claim only holds if the walk is exhaustive, so two things are enforced
+# here rather than assumed:
+#
+#   - find's exit status is checked. A subtree it cannot descend is reported on
+#     stderr and then simply missing from the listing, so an unchecked status
+#     turns "could not look" into "nothing was there" — the same conflation
+#     has_marker exists to prevent. The status cannot be read off a pipeline
+#     ending in sort, so the sort is a separate step.
+#   - symlinks are walked too (-type l), not skipped. A marker-carrying bundle
+#     reachable under an unlisted path in dist/ is a stale manifest whether the
+#     path is a link or a file, and grep reads through the link. A link that
+#     cannot be read through — dangling, or pointing at a directory — fails
+#     hard via has_marker's exit-2 path, which is the fail-closed answer: the
+#     build emits neither, so their DEBUG state is unproven, not fine.
 check_unlisted_bundles() {
-    _listing="$(find dist -type f -name '*.js' | sort)"
+    _find_status=0
+    _listing="$(find dist \( -type f -o -type l \) -print)" || _find_status=$?
+    [ "$_find_status" -eq 0 ] ||
+        fail "find exited $_find_status enumerating dist/, so part of the tree
+    was never walked and nothing was established about the files in it. Any
+    unlisted bundle there went unchecked. That is a permissions or I/O fault on
+    the artifact, not a stale manifest. Refusing to report success."
+    _listing="$(printf '%s\n' "$_listing" | sort)"
+
     while read -r _file; do
         [ -n "$_file" ] || continue
-        if grep -q -x -F "$_file" "$MANIFEST"; then
+        if is_listed "$_file"; then
             continue
         fi
         if has_marker "$MARKER_ON" "$_file" ||
@@ -113,12 +183,18 @@ main() {
         fail "$MANIFEST is empty, so no emitted bundle was found to contain
     src/shared/constants.js. That is never correct, so it is a failure and not
     a pass."
+    [ -r "$MANIFEST" ] ||
+        fail "$MANIFEST is not readable, so nothing was inspected. That is a
+    permissions or I/O fault, not a pass."
 
     count=0
     while read -r file; do
         [ -n "$file" ] || continue
         [ -f "$file" ] ||
             fail "$MANIFEST lists $file, which does not exist."
+        [ -s "$file" ] ||
+            fail "$MANIFEST lists $file, which is empty. An empty bundle
+    carries no marker and proves nothing, so this is a failure and not a pass."
         read_marker "$file"
         [ "$MARKER" = "$expected" ] ||
             fail "$file is $MARKER but this build expects $expected."

src/shared/state.js

@@ -84,8 +84,11 @@ async function loadState() {
     const result = await storageApi.get("autistmask");
     if (result.autistmask) {
         const saved = result.autistmask;
-        state.hasWallet = saved.hasWallet;
         state.wallets = saved.wallets || [];
+        // Derived, never read from storage: a profile persisted with the flag
+        // out of step with the wallet list would otherwise stay broken on
+        // every load. Nothing depends on the two disagreeing.
+        state.hasWallet = state.wallets.length > 0;
         state.trackedTokens = saved.trackedTokens || [];
         state.networkId = saved.networkId || DEFAULT_STATE.networkId;
         state.rpcUrl = saved.rpcUrl || DEFAULT_STATE.rpcUrl;

src/shared/transactions.js

@@ -113,6 +113,85 @@ function parseTokenTransfer(tt, addrLower) {
     };
 }
 
+// True when a parsed native entry moved no ETH.  Contract-call entries have
+// their amount fields blanked by parseTx, so they are never judged here.
+function movedNoEther(tx) {
+    if (tx.direction === "contract") return false;
+    return BigInt(tx.rawAmount || "0") === BigInt(0);
+}
+
+// Merge parsed normal transactions with parsed ERC-20 token transfers into
+// one row per distinct value movement.  Pure: it reads only its arguments
+// and returns a new list sorted newest block first.
+//
+// The merge key is the transaction hash for the native entry and
+// hash + token contract for each token transfer, so:
+//
+//   - A display-level contract call (a swap and friends, direction
+//     "contract") absorbs every token leg of its hash into the single
+//     native entry, because the legs are hops of one operation rather
+//     than separate movements the user made.
+//   - Otherwise each distinct token contract in the transaction keeps its
+//     own row, so a hash carrying several genuine transfers stays several
+//     rows.
+//   - The native entry of such a transaction is dropped when it moved no
+//     ETH and at least one token transfer shares its hash: that entry is
+//     the ERC-20 call itself, already represented by the token row.  A
+//     native entry that moved ETH survives alongside the token rows, since
+//     the ETH and the tokens are two real movements, and a zero-value
+//     native transaction with no token transfer on its hash survives too.
+function mergeTransactions(txs, tokenTransfers) {
+    const byKey = new Map();
+
+    // Entries are copied so consolidation never writes through to the
+    // caller's objects.
+    for (const tx of txs) {
+        byKey.set(tx.hash, { ...tx });
+    }
+
+    const absorbedHashes = new Set();
+
+    for (const parsed of tokenTransfers) {
+        const existing = byKey.get(parsed.hash);
+        if (existing && existing.direction === "contract") {
+            // For contract calls (swaps), consolidate into the original
+            // tx entry.  Prefer the "received" transfer (swap output)
+            // for the display amount.  If no received transfer exists,
+            // fall back to the first "sent" transfer (swap input).
+            const isReceived = parsed.direction === "received";
+            const needsAmount = !existing.exactValue;
+            if (isReceived || needsAmount) {
+                existing.value = parsed.value;
+                existing.exactValue = parsed.exactValue;
+                existing.rawAmount = parsed.rawAmount;
+                existing.rawUnit = parsed.rawUnit;
+                existing.symbol = parsed.symbol;
+                existing.contractAddress = parsed.contractAddress;
+                existing.holders = parsed.holders;
+            }
+            // Keep the original tx's from/to (the user's address and the
+            // contract they called), not the token transfer's from/to
+            // which may be a router or Permit2 contract.
+            continue;
+        }
+        if (existing && movedNoEther(existing)) {
+            absorbedHashes.add(parsed.hash);
+        }
+        // Every other token transfer gets its own entry.
+        byKey.set(parsed.hash + ":" + (parsed.contractAddress || ""), {
+            ...parsed,
+        });
+    }
+
+    for (const hash of absorbedHashes) {
+        byKey.delete(hash);
+    }
+
+    const merged = [...byKey.values()];
+    merged.sort((a, b) => b.blockNumber - a.blockNumber);
+    return merged;
+}
+
 async function fetchRecentTransactions(address, blockscoutUrl, count = 25) {
     log.debugf("fetchRecentTransactions", address);
     const addrLower = address.toLowerCase();
@@ -145,53 +224,11 @@ async function fetchRecentTransactions(address, blockscoutUrl, count = 25) {
     const txJson = txResp.ok ? await txResp.json() : {};
     const ttJson = ttResp.ok ? await ttResp.json() : {};
 
-    const txsByHash = new Map();
+    const txs = mergeTransactions(
+        (txJson.items || []).map((tx) => parseTx(tx, addrLower)),
+        (ttJson.items || []).map((tt) => parseTokenTransfer(tt, addrLower)),
+    );
 
-    for (const tx of txJson.items || []) {
-        txsByHash.set(tx.hash, parseTx(tx, addrLower));
-    }
-
-    // When a token transfer shares a hash with a normal tx, the normal tx
-    // is the contract call (0 ETH) and the token transfer has the real
-    // amount and symbol.  For contract calls (swaps), a single transaction
-    // can produce multiple token transfers (input, intermediates, output).
-    // We consolidate these into the original tx entry using the token
-    // transfer where the user *receives* tokens (the swap output), so
-    // the transaction list shows the final result rather than confusing
-    // intermediate hops.  We preserve the original tx's from/to so the
-    // user sees their own address, not a router or Permit2 contract.
-    for (const tt of ttJson.items || []) {
-        const parsed = parseTokenTransfer(tt, addrLower);
-        const existing = txsByHash.get(parsed.hash);
-        if (existing && existing.direction === "contract") {
-            // For contract calls (swaps), consolidate into the original
-            // tx entry.  Prefer the "received" transfer (swap output)
-            // for the display amount.  If no received transfer exists,
-            // fall back to the first "sent" transfer (swap input).
-            const isReceived = parsed.direction === "received";
-            const needsAmount = !existing.exactValue;
-            if (isReceived || needsAmount) {
-                existing.value = parsed.value;
-                existing.exactValue = parsed.exactValue;
-                existing.rawAmount = parsed.rawAmount;
-                existing.rawUnit = parsed.rawUnit;
-                existing.symbol = parsed.symbol;
-                existing.contractAddress = parsed.contractAddress;
-                existing.holders = parsed.holders;
-            }
-            // Keep the original tx's from/to (the user's address and the
-            // contract they called), not the token transfer's from/to
-            // which may be a router or Permit2 contract.
-            continue;
-        }
-        // Non-contract token transfers get their own entries.
-        const ttKey = parsed.hash + ":" + (parsed.contractAddress || "");
-        txsByHash.set(ttKey, parsed);
-    }
-
-    const txs = [...txsByHash.values()];
-
-    txs.sort((a, b) => b.blockNumber - a.blockNumber);
     const result = txs.slice(0, count);
     log.debugf("fetchRecentTransactions done, count:", result.length);
     return result;
@@ -265,4 +302,8 @@ function filterTransactions(txs, filters = {}) {
     return { transactions: filtered, newFraudContracts: newFraud };
 }
 
-module.exports = { fetchRecentTransactions, filterTransactions };
+module.exports = {
+    fetchRecentTransactions,
+    filterTransactions,
+    mergeTransactions,
+};

tests/state.test.js

@@ -0,0 +1,104 @@
+const ADDRESS = "0x66133E8ea0f5D1d612D2502a968757D1048c214a";
+
+function oneWallet() {
+    return [{ name: "Wallet 1", type: "hd", addresses: [ADDRESS] }];
+}
+
+// state.js resolves the storage API at require time, so the stub has to exist
+// before the module is loaded, and the module registry has to be reset between
+// cases because `state` is a module-level singleton.
+function loadModuleWith(persisted) {
+    jest.resetModules();
+    const set = jest.fn(async () => {});
+    global.chrome = {
+        storage: {
+            local: {
+                get: jest.fn(async () =>
+                    persisted ? { autistmask: persisted } : {},
+                ),
+                set,
+            },
+        },
+    };
+    return { mod: require("../src/shared/state"), set };
+}
+
+afterEach(() => {
+    delete global.chrome;
+});
+
+describe("loadState hasWallet reconciliation", () => {
+    // A profile that deleted its last wallet on a build predating the write
+    // path fix keeps hasWallet: true forever. It must load as no wallet, which
+    // is what sends the popup to the welcome view.
+    test("stored hasWallet true with zero wallets loads as no wallet", async () => {
+        const { mod } = loadModuleWith({ hasWallet: true, wallets: [] });
+        await mod.loadState();
+        expect(mod.state.hasWallet).toBe(false);
+    });
+
+    test("stored hasWallet true with a missing wallets key loads as no wallet", async () => {
+        const { mod } = loadModuleWith({ hasWallet: true });
+        await mod.loadState();
+        expect(mod.state.wallets).toEqual([]);
+        expect(mod.state.hasWallet).toBe(false);
+    });
+
+    test("stored hasWallet false with one wallet loads as having a wallet", async () => {
+        const { mod } = loadModuleWith({
+            hasWallet: false,
+            wallets: oneWallet(),
+        });
+        await mod.loadState();
+        expect(mod.state.hasWallet).toBe(true);
+    });
+
+    test("absent hasWallet with wallets present loads as having a wallet", async () => {
+        const { mod } = loadModuleWith({ wallets: oneWallet() });
+        await mod.loadState();
+        expect(mod.state.hasWallet).toBe(true);
+    });
+
+    test("consistent stored states are preserved", async () => {
+        const withWallet = loadModuleWith({
+            hasWallet: true,
+            wallets: oneWallet(),
+        });
+        await withWallet.mod.loadState();
+        expect(withWallet.mod.state.hasWallet).toBe(true);
+
+        const without = loadModuleWith({ hasWallet: false, wallets: [] });
+        await without.mod.loadState();
+        expect(without.mod.state.hasWallet).toBe(false);
+    });
+
+    test("empty storage leaves the default no-wallet state", async () => {
+        const { mod } = loadModuleWith(null);
+        await mod.loadState();
+        expect(mod.state.hasWallet).toBe(false);
+        expect(mod.state.wallets).toEqual([]);
+    });
+
+    // The correction is derived on every load rather than written back, so a
+    // load never has a storage side effect.
+    test("loadState does not write to storage", async () => {
+        const { mod, set } = loadModuleWith({ hasWallet: true, wallets: [] });
+        await mod.loadState();
+        expect(set).not.toHaveBeenCalled();
+    });
+
+    // Deriving must not disturb the rest of the load.
+    test("other persisted fields still load", async () => {
+        const { mod } = loadModuleWith({
+            hasWallet: false,
+            wallets: oneWallet(),
+            networkId: "sepolia",
+            theme: "dark",
+            activeAddress: ADDRESS,
+        });
+        await mod.loadState();
+        expect(mod.state.networkId).toBe("sepolia");
+        expect(mod.state.theme).toBe("dark");
+        expect(mod.state.activeAddress).toBe(ADDRESS);
+    });
+});

tests/transactions.test.js

@@ -36,6 +36,7 @@ global.chrome = { storage: { local: {} } };
 const {
     fetchRecentTransactions,
     filterTransactions,
+    mergeTransactions,
 } = require("../src/shared/transactions");
 const { KNOWN_SYMBOLS } = require("../src/shared/tokenList");
 const { debugFetch } = require("../src/shared/log");
@@ -685,6 +686,339 @@ describe("legitimate transactions are never filtered", () => {
     });
 });
 
+// ---------------------------------------------------------------------------
+// mergeTransactions is the pure core of the merge: it takes parsed native
+// entries and parsed token transfers and decides how many rows one on-chain
+// transaction becomes.  One transaction is one row per distinct value
+// movement, so the native side of a plain ERC-20 transfer must not survive
+// next to its token row (the duplicate-row bug), while a hash that really
+// did move several things must keep a row for each.
+// ---------------------------------------------------------------------------
+
+// A native entry as parseTx produces it for a decoded contract call: the
+// amount fields are blanked and direction is "contract".
+function contractCallTx(overrides = {}) {
+    return nativeTx({
+        from: VICTIM,
+        to: USDC_CONTRACT,
+        value: "",
+        exactValue: "",
+        rawAmount: "",
+        rawUnit: "",
+        valueGwei: 0,
+        direction: "contract",
+        directionLabel: "Approve",
+        isContractCall: true,
+        method: "approve",
+        ...overrides,
+    });
+}
+
+// The native entry parseTx produces for a plain ERC-20 transfer: sent to the
+// token contract, no ETH, and method "transfer", which is exactly why it is
+// not marked as a display-level contract call.
+function erc20CallTx(overrides = {}) {
+    return nativeTx({
+        from: VICTIM,
+        to: USDC_CONTRACT,
+        value: "0.0000",
+        exactValue: "0.0",
+        rawAmount: "0",
+        valueGwei: 0,
+        direction: "sent",
+        directionLabel: "Sent",
+        isContractCall: true,
+        method: "transfer",
+        ...overrides,
+    });
+}
+
+describe("mergeTransactions: one row per value movement", () => {
+    const HASH = "0x" + "d".repeat(64);
+    const OTHER_HASH = "0x" + "e".repeat(64);
+    const ROUTER = "0x3fc91a3afd70395cd496c647d5a6cc9d4b2b7fad";
+
+    test("a plain ERC-20 transfer yields one row, the token row", () => {
+        const native = erc20CallTx({ hash: HASH });
+        const token = tokenTx({
+            hash: HASH,
+            from: VICTIM,
+            to: ORDINARY_PEER,
+            direction: "sent",
+            directionLabel: "Sent",
+        });
+
+        const merged = mergeTransactions([native], [token]);
+        expect(merged).toHaveLength(1);
+        expect(merged[0].symbol).toBe("USDC");
+        expect(merged[0].exactValue).toBe("1500.5");
+        expect(merged[0].contractAddress).toBe(USDC_CONTRACT);
+    });
+
+    test("an ETH-only transfer keeps its row unchanged", () => {
+        const merged = mergeTransactions([legitimateEthSend()], []);
+        expect(merged).toHaveLength(1);
+        expect(merged[0]).toEqual(legitimateEthSend());
+    });
+
+    test("a genuine zero-value native transaction is still displayed", () => {
+        const zero = nativeTx({
+            hash: HASH,
+            from: VICTIM,
+            to: ORDINARY_PEER,
+            value: "0.0000",
+            exactValue: "0.0",
+            rawAmount: "0",
+            valueGwei: 0,
+            direction: "sent",
+            directionLabel: "Sent",
+        });
+
+        const merged = mergeTransactions([zero], []);
+        expect(merged).toEqual([zero]);
+    });
+
+    test("a zero-value native row is only absorbed by a transfer sharing its hash", () => {
+        const zero = erc20CallTx({ hash: HASH });
+        const unrelated = tokenTx({ hash: OTHER_HASH });
+
+        const merged = mergeTransactions([zero], [unrelated]);
+        expect(merged).toHaveLength(2);
+        expect(merged.map((t) => t.hash).sort()).toEqual(
+            [HASH, OTHER_HASH].sort(),
+        );
+    });
+
+    test("a native transaction that moved ETH keeps its row beside the token row", () => {
+        // An undecoded call (no method name) carrying ETH that also emitted
+        // a token transfer: two real movements, so two rows.
+        const native = nativeTx({
+            hash: HASH,
+            from: VICTIM,
+            to: ROUTER,
+            value: "0.2500",
+            exactValue: "0.25",
+            rawAmount: "250000000000000000",
+            valueGwei: 250000000,
+            direction: "sent",
+            directionLabel: "Sent",
+            isContractCall: true,
+        });
+        const token = tokenTx({ hash: HASH, from: ROUTER, to: VICTIM });
+
+        const merged = mergeTransactions([native], [token]);
+        expect(merged).toHaveLength(2);
+        expect(merged.map((t) => t.symbol).sort()).toEqual(["ETH", "USDC"]);
+    });
+
+    test("a sub-gwei ETH movement keeps its row beside the token row", () => {
+        // 500000000 wei is 0.5 gwei, so parseTx's valueGwei floors to 0 while
+        // rawAmount stays nonzero.  Deciding "moved no ETH" on valueGwei would
+        // delete this row and lose a real ETH movement, so the decision is made
+        // on rawAmount as a BigInt.
+        const native = nativeTx({
+            hash: HASH,
+            from: VICTIM,
+            to: ROUTER,
+            value: "0.0000",
+            exactValue: "0.0000000005",
+            rawAmount: "500000000",
+            valueGwei: 0,
+            direction: "sent",
+            directionLabel: "Sent",
+            isContractCall: true,
+        });
+        const token = tokenTx({ hash: HASH, from: ROUTER, to: VICTIM });
+
+        const merged = mergeTransactions([native], [token]);
+        expect(merged).toHaveLength(2);
+        expect(merged.map((t) => t.symbol).sort()).toEqual(["ETH", "USDC"]);
+        expect(merged.find((t) => t.symbol === "ETH").rawAmount).toBe(
+            "500000000",
+        );
+    });
+
+    test("a swap consolidates every token leg into one row, preferring the received leg", () => {
+        const native = contractCallTx({
+            hash: HASH,
+            to: ROUTER,
+            directionLabel: "Swap",
+            method: "execute",
+        });
+        const sentLeg = tokenTx({
+            hash: HASH,
+            from: VICTIM,
+            to: ROUTER,
+            direction: "sent",
+            directionLabel: "Sent",
+        });
+        const receivedLeg = tokenTx({
+            hash: HASH,
+            from: ROUTER,
+            to: VICTIM,
+            value: "0.2500",
+            exactValue: "0.25",
+            rawAmount: "250000000000000000",
+            rawUnit: "WETH base units (10^-18)",
+            symbol: "WETH",
+            contractAddress: WETH_CONTRACT,
+            holders: 850000,
+        });
+
+        const merged = mergeTransactions([native], [sentLeg, receivedLeg]);
+        expect(merged).toHaveLength(1);
+        expect(merged[0].symbol).toBe("WETH");
+        expect(merged[0].exactValue).toBe("0.25");
+        // The user's own address and the contract called are preserved.
+        expect(merged[0].from).toBe(VICTIM);
+        expect(merged[0].to).toBe(ROUTER);
+        expect(merged[0].directionLabel).toBe("Swap");
+    });
+
+    test("a swap whose legs are all sent takes its amount from the first sent leg", () => {
+        const native = contractCallTx({
+            hash: HASH,
+            to: ROUTER,
+            directionLabel: "Swap",
+            method: "execute",
+        });
+        const firstSent = tokenTx({
+            hash: HASH,
+            from: VICTIM,
+            to: ROUTER,
+            direction: "sent",
+            directionLabel: "Sent",
+        });
+        const secondSent = tokenTx({
+            hash: HASH,
+            from: VICTIM,
+            to: ROUTER,
+            value: "0.2500",
+            exactValue: "0.25",
+            rawAmount: "250000000000000000",
+            rawUnit: "WETH base units (10^-18)",
+            symbol: "WETH",
+            contractAddress: WETH_CONTRACT,
+            holders: 850000,
+            direction: "sent",
+            directionLabel: "Sent",
+        });
+
+        const merged = mergeTransactions([native], [firstSent, secondSent]);
+        expect(merged).toHaveLength(1);
+        // With no received leg the display amount comes from the first sent
+        // leg, and a later sent leg does not overwrite it.
+        expect(merged[0].symbol).toBe("USDC");
+        expect(merged[0].exactValue).toBe("1500.5");
+        expect(merged[0].contractAddress).toBe(USDC_CONTRACT);
+        expect(merged[0].holders).toBe(3500000);
+    });
+
+    test("a contract call carrying ETH plus a token transfer stays one row", () => {
+        const native = contractCallTx({
+            hash: HASH,
+            to: ROUTER,
+            directionLabel: "Swap",
+            method: "swapExactETHForTokens",
+            valueGwei: 250000000,
+        });
+        const received = tokenTx({ hash: HASH, from: ROUTER, to: VICTIM });
+
+        const merged = mergeTransactions([native], [received]);
+        expect(merged).toHaveLength(1);
+        expect(merged[0].symbol).toBe("USDC");
+        expect(merged[0].exactValue).toBe("1500.5");
+        // The ETH leg is still visible as the row's native quantity.
+        expect(merged[0].valueGwei).toBe(250000000);
+    });
+
+    test("an approve keeps its row and survives the filters", () => {
+        const approve = contractCallTx({ hash: HASH });
+
+        const merged = mergeTransactions([approve], []);
+        expect(merged).toEqual([approve]);
+        expect(filterTransactions(merged, filters()).transactions).toEqual([
+            approve,
+        ]);
+    });
+
+    test("a contract creation keeps its row", () => {
+        const creation = nativeTx({
+            hash: HASH,
+            from: VICTIM,
+            to: "",
+            value: "0.0000",
+            exactValue: "0.0",
+            rawAmount: "0",
+            valueGwei: 0,
+            direction: "sent",
+            directionLabel: "Sent",
+        });
+
+        expect(mergeTransactions([creation], [])).toEqual([creation]);
+    });
+
+    test("a native self-send keeps its single row", () => {
+        const selfSend = nativeTx({
+            hash: HASH,
+            from: VICTIM,
+            to: VICTIM,
+            direction: "sent",
+            directionLabel: "Sent",
+        });
+
+        expect(mergeTransactions([selfSend], [])).toEqual([selfSend]);
+    });
+
+    test("a token self-send yields one row", () => {
+        const native = erc20CallTx({ hash: HASH });
+        const token = tokenTx({
+            hash: HASH,
+            from: VICTIM,
+            to: VICTIM,
+            direction: "sent",
+            directionLabel: "Sent",
+        });
+
+        const merged = mergeTransactions([native], [token]);
+        expect(merged).toHaveLength(1);
+        expect(merged[0].symbol).toBe("USDC");
+        expect(merged[0].from).toBe(VICTIM);
+        expect(merged[0].to).toBe(VICTIM);
+    });
+
+    test("several distinct tokens moved by one ERC-20 call keep a row each", () => {
+        const native = erc20CallTx({ hash: HASH });
+        const usdc = tokenTx({ hash: HASH });
+        const weth = tokenTx({
+            hash: HASH,
+            symbol: "WETH",
+            contractAddress: WETH_CONTRACT,
+            holders: 850000,
+        });
+
+        const merged = mergeTransactions([native], [usdc, weth]);
+        expect(merged.map((t) => t.symbol).sort()).toEqual(["USDC", "WETH"]);
+    });
+
+    test("rows are sorted by block number, newest first", () => {
+        const older = nativeTx({ hash: HASH, blockNumber: 21000000 });
+        const newer = nativeTx({ hash: OTHER_HASH, blockNumber: 21000010 });
+
+        const merged = mergeTransactions([older, newer], []);
+        expect(merged.map((t) => t.blockNumber)).toEqual([21000010, 21000000]);
+    });
+
+    test("the entries handed in are never mutated", () => {
+        const native = contractCallTx({ hash: HASH, method: "execute" });
+        const token = tokenTx({ hash: HASH });
+        const before = JSON.stringify([native, token]);
+
+        mergeTransactions([native], [token]);
+        expect(JSON.stringify([native, token])).toBe(before);
+    });
+});
+
 // ---------------------------------------------------------------------------
 // fetchRecentTransactions owns the per-address merge of normal transactions
 // with ERC-20 transfers.  (The cross-address merge Home performs lives in
@@ -886,13 +1220,12 @@ describe("fetchRecentTransactions merge and dedup", () => {
         expect(txs.map((t) => t.symbol).sort()).toEqual(["USDC", "WETH"]);
     });
 
-    // Documents current behaviour: for a plain ERC-20 transfer the method is
+    // Regression guard for the duplicate-row bug: for a plain ERC-20
-    // "transfer", so parseTx does not mark the entry as a contract call in
+    // transfer the method is "transfer", so parseTx does not mark the entry
-    // the display sense and the merge loop does not consolidate the token
+    // as a contract call in the display sense.  The native side of that
-    // transfer into it.  The result is two entries for one transaction: a
+    // transaction moved no ETH and is represented by the token row, so it
-    // zero-value native row and the real token row.  The zero-value row also
+    // must not survive the merge as a second, zero-value row.
-    // escapes dust filtering because isContractCall is true.
+    test("a plain ERC-20 transfer produces exactly one entry", async () => {
-    test("current behaviour: a plain ERC-20 transfer produces two entries", async () => {
         const hash = "0x" + "5".repeat(64);
         respondWith(
             [
@@ -925,14 +1258,15 @@ describe("fetchRecentTransactions merge and dedup", () => {
         );
 
         const txs = await fetchRecentTransactions(VICTIM, BLOCKSCOUT);
-        expect(txs).toHaveLength(2);
+        expect(txs).toHaveLength(1);
-        expect(txs.map((t) => t.symbol).sort()).toEqual(["ETH", "USDC"]);
+        expect(txs[0].symbol).toBe("USDC");
-        const nativeRow = txs.find((t) => t.symbol === "ETH");
+        expect(txs[0].exactValue).toBe("1.0");
-        expect(nativeRow.exactValue).toBe("0.0");
+        expect(txs[0].direction).toBe("sent");
-        expect(nativeRow.isContractCall).toBe(true);
+        expect(txs[0].contractAddress).toBe(USDC_CONTRACT);
-        // And the zero-value row is not removed by the dust filter.
+        // The surviving row is the token row, and the filters keep it.
         const kept = filterTransactions(txs, filters()).transactions;
-        expect(kept).toHaveLength(2);
+        expect(kept).toHaveLength(1);
+        expect(kept[0].symbol).toBe("USDC");
     });
 
     test("entries are sorted by block number descending and capped at count", async () => {