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opencode/specs/16-i18n-hardening-and-parity.md

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+## i18n hardening and parity
+
+Strengthen locale correctness and remove remaining hardcoded copy.
+
+---
+
+### Summary
+
+The app has broad translation coverage but still has maintainability gaps: locale dictionaries are typed as `Partial`, some non-English dictionaries contain English values for specific keys, and a few user-facing strings are still hardcoded in components/pages. This spec hardens i18n guarantees and cleans up remaining drift.
+
+---
+
+### Goals
+
+- Enforce stricter dictionary key parity across all app locales.
+- Remove known English fallback strings from non-English locale files.
+- Localize remaining hardcoded user-facing strings in scoped files.
+- Keep existing localization architecture (`useLanguage().t(...)`) intact.
+
+---
+
+### Non-goals
+
+- No translation quality rewrite for all strings.
+- No locale expansion beyond existing languages.
+- No changes to non-user-facing log/diagnostic strings.
+
+---
+
+### Parallel ownership (important)
+
+This workstream owns:
+
+- `packages/app/src/context/language.tsx`
+- `packages/app/src/i18n/*.ts`
+- `packages/app/src/components/dialog-custom-provider.tsx`
+- `packages/app/src/pages/directory-layout.tsx`
+
+This workstream must not edit:
+
+- `pages/session.tsx`, `pages/layout.tsx`, `components/prompt-input.tsx`
+- server/terminal integration files owned by specs 14/15
+
+---
+
+### Current state
+
+- Locale files are large and manually maintained.
+- Non-English locales are typed with `Partial<Record<Keys, string>>`, which allows silent missing keys.
+- Known untranslated strings exist for keys like:
+  - `command.session.previous.unseen`
+  - `command.session.next.unseen`
+- Some user-facing strings remain hardcoded in scoped files.
+
+---
+
+### Proposed approach
+
+1. Tighten locale typing:
+
+- Move from `Partial<Record<Keys, string>>` to stricter parity enforcement.
+- Keep `en.ts` as source-of-truth key set.
+
+2. Fix known untranslated key values in non-English dictionaries.
+
+3. Localize scoped hardcoded strings by adding translation keys and using `language.t(...)`.
+
+---
+
+### Phased steps
+
+1. Add/adjust shared locale typing pattern for parity safety.
+2. Update all locale files to satisfy stricter typing.
+3. Translate known English carry-over keys in non-English dictionaries.
+4. Replace hardcoded copy in:
+
+- `components/dialog-custom-provider.tsx`
+- `pages/directory-layout.tsx`
+
+5. Run typecheck and parity checks.
+
+---
+
+### Acceptance criteria
+
+- Locale files enforce full key parity against `en` (compile-time).
+- No known English carry-over values remain for the targeted keys in non-English locales.
+- Scoped hardcoded user-facing strings are replaced with translation keys.
+- Typecheck passes.
+
+---
+
+### Validation plan
+
+- Typecheck: `bun run typecheck` (from `packages/app`).
+- Grep sanity checks:
+  - targeted keys no longer English in non-English locales
+  - scoped files no longer contain hardcoded user-facing copy
+- Manual spot checks in at least 2 locales (for example: `de`, `zh`).
+
+---
+
+### Handoff notes
+
+- Keep key naming consistent with existing conventions.
+- Avoid broad copy changes outside scoped files to reduce review surface.
+- If translation wording is uncertain, keep it simple and literal for now; quality passes can follow.