feat(i18n): extract sandbox + all remaining UI areas to the i18n dictionaries

[viktormarinho]

Summary

Final extraction PR of the i18n effort (mechanism: #4959, settings area: #4964). Covers everything that was left: sandbox, chat, registry, orgs (connections/members/monitoring), sections-editor, task-board, library, reports, virtual-mcp, home, admin, onboarding, and remaining components/layouts/routes.

3,941 keys now live in 32 per-domain dictionary files (en + pt-BR), each pt-BR file type-checked complete via satisfies — bun run check remains the translation-completeness proof. English UI copy is unchanged (values extracted verbatim).

How it was produced

• Two extraction fleets (39 + 142 haiku agents, one per file / small-file group, per-file key namespaces → zero collisions), followed by a deterministic dictionary merge.
• A 46-cluster repair fleet (sonnet) + manual pass for the 131 type errors the extraction left (missing useT, labelKey fields typed as string, undefined-unsafe interpolation vars, label→labelKey call sites).
• APPROVAL_LEVEL_OPTIONS now carries labelKey/shortKey translation keys and chat surfaces render via t() — closes the known seam from feat(i18n): zero-dep i18n module with pt-BR support and language preference #4959.
• TranslationKey re-exported from use-t.ts; TFunction threaded through helpers receiving t.

Verification (deterministic, not vibes)

• tsc --noEmit (apps/mesh): 0 errors — every t() key literal-checked against the union.
• Key↔usage cross-check: 0 keys used but missing; 79 orphan keys removed from both dictionaries.
• en↔pt placeholder parity: identical {var} sets for all keys (4 benign en-only {plural} vars where pt uses parenthetical forms).
• ICU-syntax grep: 0 (invented {count, plural, ...} forms replaced with plain {var} in 14 keys).
• Web unit suite: zero regressions vs origin/main (verified by diffing failing-test sets against a clean main worktree; 18 order-dependent failures pre-exist on both).

Collateral hardening

• useLocalStorage guards a missing localStorage (non-browser render contexts get defaults) — components that now resolve copy via useT no longer explode in polluted test environments.
• Component tests for tier-trigger / assistant / blocks-tab wrap renders in a QueryClientProvider; the pure-logic test for mobile tab labels passes a real t built from the en dictionary (no mocks).
• Two files corrupted by smart-quote-writing agents were restored byte-exact (em-dashes/arrows included).

Known deferrals (TODO(i18n), per AGENTS.md convention)

Module-scope Zod validation messages and JSX-interleaved rich-text sentences (~30 spots) are marked for a manual pass. Server-originated error messages and transactional emails remain deliberately out of scope.

Testing

• bunx tsc --noEmit (apps/mesh) ✅ 0 errors
• bun test apps/mesh/src/web ✅ no regressions vs main
• bun run lint ✅ 0 errors · bun run fmt ✅ · knip clean

🤖 Generated with Claude Code

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Summary by cubic

Finished extracting sandbox and all remaining UI into i18n with full pt-BR coverage, locale‑aware time, and a one‑time auto‑switch heads‑up for Portuguese‑browser users; merged latest main.

• ~3,900 keys across 33 per‑domain dictionaries (en, pt-BR), literal UTF‑8; type‑checked complete via bun run check.

• New Features

  • Localized remaining UI (incl. sandbox): automations, chat (tool calls, input/editor, banners), connections/details, file/GitHub pickers, header/org switcher, home/tiles, deck toolbar, monitoring, prompts, collections, import, org create/invite, errors/shortcuts. Includes aria labels, toasts, dialogs.
  • Added language-announcement-dialog with auto‑switch for Portuguese browsers and quick revert; commerce‑onboarding language switcher is now a dropdown (EN, PT-BR).
  • SDK/dev: approval levels and model/tier/context labels use labelKey/shortKey; threaded t through helpers (model selectors, uploader, tools popover); relative time respects the selected locale.

• Bug Fixes

  • Preserved Portuguese‑first surfaces by restoring original Portuguese copy in en where intended.
  • Hoisted useT out of conditional branches to fix hook‑order crashes; adjusted helpers that receive t.
  • CI/tests: wrapped components using useT in QueryClientProvider (assistant, tier‑trigger, tiptap input, propose‑plan); fixed date-fns pt-BR locale imports and ensured dictionaries are literal UTF‑8.

^{Written for commit 4c6b896. Summary will update on new commits.}