fix: floor the persisted fields a restore dereferences, and make each field's floor an executable claim (closes #362)

A persisted container was checked while its ENTRIES were dereferenced
unchecked. A stored `{"0x…": "notalist"}` in allowedSites passes the state
gate, renders a working popup, and then throws inside saveState()'s per-
hostname merge, so every save from that moment on fails while the UI looks
entirely healthy. deniedSites has the identical shape; fraudContracts is the
same class with a milder consequence.

The sweep for that class found four more:

- selectedToken, dereferenced as text behind a truthiness-only restore gate.
- rpcUrl, handed whole to `new JsonRpcProvider()` by getProvider(), which
  throws SYNCHRONOUSLY for a non-string — from txStatus.js and addWallet.js,
  neither inside a try, and the first reachable from a stored
  `currentView: "wait-tx"` through the unguarded restoreView().
- The ENTRIES of viewData. Four restore branches gate on one truthy field and
  hand the rest to a renderer that calls address.toLowerCase(): a stored
  `{"currentView":"success-tx","viewData":{"hash":"0x1"}}` throws out of
  restoreView(), skipping the rest of popup init.
- selectedWallet / selectedAddress. `wallets` is a real Array, so a stored
  "map", "length", "constructor" or "__proto__" is TRUTHY: hasValidAddress()'s
  `&&` does not short-circuit and `.addresses[…]` throws. A stale INTEGER index
  is the safe case.

Floors, in src/shared/persistedState.js: allowedSites/deniedSites through
siteMap(), fraudContracts and each hostname list through textList(),
selectedToken and activeAddress as text-or-null, rpcUrl and blockscoutUrl as
non-empty text, selectedWallet and selectedAddress as a non-negative integer
or null, and each networkEndpoints pair's two URL fields — which
applyChainSwitchFields() assigns straight onto s.rpcUrl on the next switch.

Guards, in src/popup/viewRouter.js: the four restore branches that gate on one
truthy field now check the entries their renderer dereferences, as
txStatus.restoreWait() has always done for wait-tx. "confirm-tx" joins
ADDRESS_VIEWS, because its Sign button dereferences
state.wallets[state.selectedWallet] behind no guard of its own.

A stored own "__proto__" key is dropped by siteMap(): it can never be a wallet
address, so it grants nothing, and keeping it only keeps a value the next save
would hand to the prototype setter. networkEndpoints keeps unknown keys by
design, so mergeMapByKey() in src/shared/state.js now writes with
defineProperty as well — the guard in the floor was being undone one layer
downstream.

A save that fails is also told, not merely repaired: onSaveFailure() reports
every failed save, awaited or not (the save queue's own rejection handler is
what made a failure vanish), and the popup raises a persistent "NOT SAVED"
banner naming the reason. doRefreshAndRender() no longer rejects, since every
one of its call sites fires it and walks away.

The per-field justification in the header of src/shared/stateSchema.js is
replaced by tests/persistedFieldContract.test.js. That comment shipped a false
claim in three consecutive changes; the artifact was the problem. The test is
one row per persisted field, declaring the property that field's floor is
claimed to have and PROVING it by driving the real code with hostile values —
the gate for a field the gate refuses, normalizePersisted() for a field it
floors, the real JsonRpcProvider constructor for rpcUrl, and — for every field
whose only defence is that nothing dereferences it structurally — a boot of the
real popup entry point over that value onto EVERY view the popup can reopen
onto.

That last part is what makes the claim falsifiable, and it is why this defect
class is worth a harness at all: it lives on the RESTORE path and not on Home.
So the suite goes red on a field one of those boots corrupts and a restorable
view dereferences on its render, at EITHER POLARITY — a value nothing in src/
writes is a wrong-typed one and therefore truthy, so every such field is also
driven falsy, or proven unable to be falsy after the floor. Without that, a
dereference behind `if (!state.x)` is never reached on the very boot that
corrupts x, and for three of these fields the falsy answer is the DEFAULT_STATE
default: the branch every ordinary install takes. It goes red too on a field
that gains a floor while its row still claims it has none, and on a field added
to PERSISTED_FIELDS with no row.

Two things it does not drive, and the artifacts say so rather than claiming
total coverage: a MIX of polarities, since one boot puts every corrupted field
on the same slot, so a branch reached only when one is truthy and another falsy
is not entered; and whatever no stored record reaches by itself — a view only
forward navigation opens, and anything behind a click. The header and the
README mirror now point at the test instead of restating it.

The boots are cheap enough to keep by construction rather than by sampling.
Every field the router itself reads is driven onto each view individually,
since a hostile value in one of those legitimately changes which view renders;
every other unfloored field is corrupted on the SAME boot, and that boot has to
land on the view it stored — so a field that does move the routing cannot hide
in the crowd, and the failure path re-boots one field at a time to name it.
That is forty-four boots instead of several hundred; the suite runs in 12.7s
against a 30s cap.

The DOM stub in tests/support/popupBoot.js gained one thing to make any of that
possible: an element's parentElement. Without it success-tx and transaction
threw on the first line that hides a field's wrapper, so neither renderer could
be booted onto at all — every boot aimed at them fell back to Home instead, and
the base profile the sweep starts from is now asserted to render each view
rather than fall back, so that cannot go unnoticed again.

README.md

@@ -1052,18 +1052,17 @@ driving the real code with hostile values — and, for every field whose only
 defence is that nothing dereferences it, by booting the real popup entry point
 over that value onto every view the popup can reopen onto. That last part is
 what makes the claim falsifiable, because this defect class lives on the restore
-path rather than on the home screen. Read the claim narrowly, as that file
-states it: what those boots prove is no structural dereference on the code paths
-a WHOLLY-CORRUPTED PROFILE takes, which is not every path a stored record takes.
-Not driven: any pairing of values the four slots do not produce, a view only
-forward navigation opens, anything behind a click, and everything a healthy
-profile reaches. Within that boundary the verdict is unconditional — if one of
-those boots leaves the popup unhealthy or off the view it stored, `make check`
-fails, including when it takes two corrupted fields at once, because the verdict
-is the combined boot and the per-field re-boot that names a culprit can only
-decorate the message. So does a field that gains a floor while its row still
-claims it has none, and so does a field added to `PERSISTED_FIELDS` with no row
-at all. The per-field justification that used to live in the header of
+path rather than on the home screen: a field one of those boots corrupts and a
+restorable view dereferences on its render fails `make check`, at either
+polarity — a value nothing writes is a wrong-typed one and therefore truthy, so
+each such field is also driven falsy, or proven unable to be falsy after the
+floor. So does a field that gains a floor while its row still claims it has
+none, and so does a field added to `PERSISTED_FIELDS` with no row at all. Two
+things the boots do not drive: a MIX of polarities, since one boot puts every
+corrupted field on the same slot, so a branch reached only when one is truthy
+and another falsy is not entered; and whatever no stored record reaches by
+itself — a view only forward navigation opens, and anything behind a click. The
+per-field justification that used to live in the header of
 `src/shared/stateSchema.js` shipped a false claim in three consecutive changes,
 each caught only by a reviewer re-deriving thirty fields by hand.
 

TODO.md

@@ -85,15 +85,9 @@ but the review is broader than any of them.
   the path this whole class of defect lives on. Each such field is driven at
   both polarities — a value nothing writes is wrong-typed and so truthy, so a
   falsy slot is driven too, or the field is proven unable to be falsy after the
-  floor. The claim is narrow and stated as such: no structural dereference on
-  the code paths a wholly-corrupted profile takes, which is not every path a
-  stored record takes — a pairing of values the four slots do not produce, a
-  view only forward navigation opens, anything behind a click, and everything a
-  healthy profile reaches are all undriven. Within that boundary the verdict is
-  unconditional, including a dereference that takes two corrupted fields at
-  once, since the assertion is on the combined boot and the per-field re-boot
-  can only decorate the message. A field with no row and a field that gains a
-  floor while its row still claims it has none also fail `make check`.
+  floor. A field with no row, a field that gains a floor while its row still
+  claims it has none, and a field one of those boots corrupts and a restorable
+  view dereferences on its render now all fail `make check`.
 - 2026-08-23: A swap amount and the token it is counted in now always come from
   the same hop, on both sides of the approval screen
   ([#359](https://git.eeqj.de/sneak/AutistMask/issues/359) and

src/shared/stateSchema.js

@@ -38,16 +38,15 @@
 // real popup entry point onto EVERY view the popup can reopen onto.
 //
 // That last part is the whole point, because this defect class lives on the
-// RESTORE path and not on Home. Take the claim NARROWLY, exactly as that file
-// states it: what those boots prove is no structural dereference on the code
-// paths a WHOLLY-CORRUPTED PROFILE takes — which is not every path a stored
-// record takes. Not driven: any pairing of values the four slots do not
-// produce, a view only forward navigation opens, anything behind a click, and
-// everything a healthy profile reaches. Within that boundary the verdict is
-// unconditional, including a dereference that takes two corrupted fields at
-// once. That suite also goes red on a field that gains a floor while its row
-// still claims it has none, and on a field added to PERSISTED_FIELDS with no
-// row at all.
+// RESTORE path and not on Home: a field one of those boots corrupts and a
+// restorable view dereferences on its render turns that suite red, at either
+// polarity — a value nothing writes is wrong-typed and so truthy, so each such
+// field is also driven falsy, or proven unable to be falsy after the floor. So
+// does a field that gains a floor while its row still claims it has none. Two
+// things the boots do not drive: a MIX of polarities, since one boot puts every
+// corrupted field on the same slot; and whatever no stored record reaches by
+// itself — a view only forward navigation opens, and anything behind a click. A
+// field added to PERSISTED_FIELDS with no row fails the suite too.
 //
 // That test exists because this comment did not work. It carried a
 // hand-written justification per field, and it shipped a false one in three

tests/persistedFieldContract.test.js

@@ -44,32 +44,12 @@
 // reason, and a field that cannot be falsy after the floor says so in its row
 // and is proven so.
 //
-// READ THE CLAIM NARROWLY. What this file proves is: NO STRUCTURAL
-// DEREFERENCE ON THE CODE PATHS A WHOLLY-CORRUPTED PROFILE TAKES. That is not
-// every path a stored record takes, and the difference is the whole of what
-// this file does not cover:
-//
-//   - Only the values in the table, in the SLOT arrangement below: four value
-//     combinations per view, not the product of twelve fields. A dereference
-//     reached only under a pairing no slot produces is not driven at all.
-//   - Only what a stored record reaches by ITSELF. A view only forward
-//     navigation opens, and anything behind a click, is not driven.
-//   - Nothing about the paths a HEALTHY profile takes, which is most of the
-//     popup. This file is a floor under one defect class, not a proof about
-//     the renderers.
-//
-// Within that boundary it is unconditional: if one of these boots leaves the
-// popup unhealthy or off the view it stored, this file goes red — including
-// when it takes two corrupted fields at once, because the verdict is the
-// combined boot itself and the per-field re-boot below can only decorate the
-// message. That last part is the one thing an earlier version got wrong: it
-// asserted on the per-field list, so an observed dead popup that no single
-// field reproduced was reported green.
-//
-// Booting every field separately at every value would be several hundred boots
-// and most of the suite's budget; this is forty-four. Widening it further is
-// out of scope — proving no field is dereferenced on any reachable render path
-// is exhaustive verification of the popup, not a floor under a stored record.
+// What that buys: a field any restorable view dereferences on that view's
+// render turns this file red, at either polarity. What it does not buy is a
+// MIX of polarities — one boot puts every swept field on the same slot, so a
+// branch reached only when one swept field is truthy and another falsy is not
+// entered. Booting every field separately at every value would be several
+// hundred boots and most of the suite's budget; this is forty-four.
 //
 // The three claims this replaced, all false, all caught here by construction:
 // rpcUrl reaching `new JsonRpcProvider()` (a synchronous throw, not a caught
@@ -758,23 +738,17 @@ describe("a hostile routing value restoring onto", () => {
 // routing turns this red and has to declare `routes` and take the individual
 // sweep above.
 //
-// Combining hides one thing, and the last slot is what stops it. A hostile
+// Combining does hide one thing, and the last slot is what stops it. A hostile
 // value is wrong-typed and therefore TRUTHY, so on a boot where every swept
 // field is hostile, no `if (!state.x)` branch is entered — and a dereference
 // inside such a branch would go unseen however loudly it throws. The last slot
 // is the falsy one: every swept field that CAN be falsy is falsy on it, which
 // is also the state an ordinary install boots in for three of them, while the
-// fields that cannot be falsy stay hostile-truthy. That makes it a MIX, and a
-// deliberate one — the interaction between a falsy flag and a still-hostile
-// theme is a shape a stored record really produces.
-//
-// The verdict is the combined boot, always. When it goes red the same view is
-// re-booted one field at a time, so the failure NAMES a culprit instead of
-// leaving a reader to bisect twelve fields — but that loop only decorates the
-// message. It cannot clear the failure. A dereference that needs two corrupted
-// fields at once is reproduced by neither field alone, and a version of this
-// file that asserted on the named list reported exactly that case green while
-// watching the popup die.
+// fields that cannot be falsy stay hostile. Beyond that, a throw fails the boot
+// whichever field threw, and a renderer that never ran is what `restored`
+// forbids. When it does go red, the same view is re-booted one field at a time
+// so the failure names the fields rather than leaving a reader to bisect twelve
+// of them.
 const UNROUTED = CONTRACT.filter((row) => swept(row) && !routes(row));
 const HOSTILE_SLOTS = Math.max(
     ...UNROUTED.map((row) => sweptValues(row).length),
@@ -800,42 +774,29 @@ describe("every field the router does not read, corrupted at once, onto", () =>
                     restoringOnto(view, fields),
                     view,
                 );
-
-                // The per-field re-boot only DECORATES the message. The
-                // verdict is `together`, unconditionally: a dereference that
-                // needs two corrupted fields at once is reproduced by NEITHER
-                // field alone, so an assertion on the named list would report
-                // an observed dead popup as green.
-                const named = [];
-                if (together.errors.length > 0 || !together.restored) {
-                    for (const row of UNROUTED) {
-                        const one = await restoredHealth(
-                            restoringOnto(view, {
-                                [row.field]: fields[row.field],
-                            }),
-                            view,
-                        );
-                        if (one.errors.length === 0 && one.restored) continue;
-                        named.push(
-                            `${row.field}=${JSON.stringify(
-                                fields[row.field],
-                            )}: ` +
-                                (one.errors.join("; ") || `fell off ${view}`),
-                        );
-                    }
-                    if (named.length === 0) {
-                        named.push(
-                            "no single field reproduces it; it takes two or " +
-                                `more of ${JSON.stringify(fields)}`,
-                        );
-                    }
+                if (together.errors.length === 0 && together.restored) {
+                    expect(together).toEqual(RESTORED);
+                    return;
                 }
 
-                expect({
+                const named = [];
+                for (const row of UNROUTED) {
+                    const one = await restoredHealth(
+                        restoringOnto(view, {
+                            [row.field]: fields[row.field],
+                        }),
+                        view,
+                    );
+                    if (one.errors.length === 0 && one.restored) continue;
+                    named.push(
+                        `${row.field}=${JSON.stringify(fields[row.field])}: ` +
+                            (one.errors.join("; ") || `fell off ${view}`),
+                    );
+                }
+                expect({ view: view, fields: named }).toEqual({
                     view: view,
-                    together: together,
-                    fields: named,
-                }).toEqual({ view: view, together: RESTORED, fields: [] });
+                    fields: [],
+                });
             });
         }
     }