Localize remaining Paper capture composer copy

[Chris0Jeky]

Summary

• move the remaining PaperCaptureComposer header, metadata, footer, and submit copy into the Inbox catalogs
• add Spanish and Italian translations alongside English
• prove first-render and post-mount locale switching without changing composer behavior or stable selectors

Verification

• red-first baseline detector failed because the baseline composer still contained all four target literals
• current source literal detector passed; all four target literals are catalog-backed
• focused composer and catalog suites: 64 passed
• npm run typecheck: passed
• production build: passed; existing ineffective toastStore dynamic-import warning remains
• scoped ESLint: passed with one pre-existing label-has-for warning at PaperCaptureComposer.vue:355
• git diff --check: passed

The slice is limited to the remaining composer-copy residual from #1871. The review-i18n half and other Inbox bare-English residuals remain out of scope.

Refs #1871

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[Chris0Jeky]

Fresh-context review record (coordinator, 2026-09-06; read-only Opus 5 reviewer over the diff against the merge base; route: the standing D-12 rule for Codex-session PRs — review, fix MEDIUM+ in-PR, merge, disposition comment).

VERDICT: SHIP (round 1). Fixed in-PR (round 2, coordinator commit on this branch; composer specs and the catalog guard green): MEDIUM-1 — the footer's <span class="tk-ink-italic">Inbox</span> emphasis (a real Paper token: serif italic in ember) was flattened into one plain string, so the word lost its treatment on every render and the .text() assertion could not see it. The footer is now three parallel keys (footerBefore, footerInbox, footerAfter) in all three catalogs and the template re-wraps the middle one; rendered text is byte-identical.

Recorded, not fixed: LOW — the English meta string is recapitalised ("saves to Inbox") versus the source literal ("saves to inbox"), a defensible product-name fix but undisclosed in the body; LOW — the catalog doc-comment above composer: still describes only the field chrome and does not mention the four (now six) new keys.