[Frontend] Review-i18n + board-picker polish residuals (PR #1869 / #1870 reviews)

[Chris0Jeky]

Small hardening/polish residuals from the PR #1869 and PR #1870 reviews (none merge-relevant):

Review i18n (PR #1869):

1. StoredConfidenceBreakdown is a pure type alias - it documents but does not enforce the wire-key invariant; a branded key type (or distinct wireKey field) would make fetch-time translation a compile error.
2. The 401/403 branch of describeErrorKey (TranscriptEvidenceViewer.vue) has no test; with missingWarn off, a catalog rename would silently render the raw key. One mockRejectedValue({response:{status:403}}) case closes it.
3. The es locale is unasserted on the transcript error path (it is asserted for confidence labels).
4. A11y: the error paragraph carries role="alert" and its text changes on locale switch - a screen reader may re-announce a stale failure.

Board picker (PR #1870):
5. The composer hint is not selection-bound: with a view-only board preselected via defaultBoardId, the disabled Capture button is explained only by the generic hint. Bind the hint to the selected option.
6. Pre-existing hardcoded English beside the new localized strings: 'No board · land in inbox' / 'Select a board…' - an ADR-0054 §8 all-or-nothing gap in the Inbox surface, predating #1870. Extract on the next Inbox i18n touch.

[Chris0Jeky]

Codex lane claim

I am taking the bounded TD-1871-picker-literals row only. I will route the two hardcoded Inbox picker options named in this issue — No board · land in inbox in PaperCaptureComposer.vue and Select a board… in PaperTriageTable.vue — through the existing inbox.boardPicker catalogs for en/it/es, with focused component coverage. The already-landed selected-board hint, transcript error coverage, wire-key typing, and alert-announcement rows remain out of scope.

[Chris0Jeky]

Codex lane release

• Slice: TD-1871-picker-literals
• PR: i18n: localize Inbox board picker options #2654 (i18n: localize Inbox board picker options #2654)
• Exact head: �a24bd6ffb57f9344135470e5edf730d0beacdeb
• Scope: the two hardcoded board-picker options named in this issue now use inbox.boardPicker keys; en/it/es catalogs and locale-aware component tests were updated. No other [Frontend] Review-i18n + board-picker polish residuals (PR #1869 / #1870 reviews) #1871 residual was changed.
• Verification: focused composer/triage/catalog suites 119/119, three repeated runs 119/119 each,
  pm run typecheck, scoped ESLint, and git diff --check passed. ESLint retains one pre-existing unrelated label-has-for warning at PaperCaptureComposer.vue:352.
• Review: two coordinator passes were clean (scope/catalog parity; adversarial raw-literal and repeated-locale checks). Hosted Codex review is unavailable because the account review quota is exhausted.

PR is open and ready for review. This does not close #1871; transcript/error, wire-key, and accessibility residuals remain separate.

[Chris0Jeky]

Coordinator note (2026-09-05, D-12 sweep): the Codex session's PR on this issue was reviewed by one fresh-context Opus 5 reviewer (record on the PR) and merged with a merge commit. The PR body used Refs, so this issue stays open; what merged and what remains, from the review:

• PR #2625 merged as 38382158c: TranscriptEvidenceViewer.spec.ts covers the 401 and 403 unauthorized branches in English and Spanish (the title says every supported locale, but Italian is not asserted; LOW).
• PR #2654 merged as 221ed702d: the composer's no-board option and the triage picker placeholder go through inbox.boardPicker in en, es and it. Remaining hardcoded English in the same two components, from the review: PaperTriageTable.vue:549 (aria-label="Captured items"), :755 (Board), :759 (aria-label="Choose a board for this capture"); PaperCaptureComposer.vue:245-246, 297, 303, 307, 327, 332-333, 353, 357 (Body, Board, Labels, Due (optional), both placeholders, four aria-labels, the attachments note).