chore(renderer): remove the dead i18n module cluster

[mrsibe]

What does this PR do?

Deletes three renderer modules that were unreachable from every entry point, so the app no longer ships and maintains a second, drifted i18n implementation that looks live.

Why?

• src/renderer/src/components/LanguageSelector.tsx
• src/renderer/src/components/Versions.tsx
• src/renderer/src/lib/i18n.ts

lib/i18n.ts was a complete second i18n implementation — its own locale cache, its own useTranslation, t, getTranslation, formatMessage and pluralize — while the app uses i18next through src/renderer/src/i18n.ts. Its only importer was LanguageSelector, which was itself unused; preloadLocales had no consumer at all. Versions.tsx rendered the Electron/Chromium/Node versions and was never mounted.

Dead i18n code that looks live is a trap: it invites someone to "fix" a translation in a module the app never calls. The second implementation had already drifted — its Namespace union omits anki and shortcuts, which exist in locales/ and in i18n.ts.

Related issue

Fixes #87

What changed?

• Deleted src/renderer/src/components/LanguageSelector.tsx
• Deleted src/renderer/src/components/Versions.tsx
• Deleted src/renderer/src/lib/i18n.ts

Nothing else. lib/ keeps dragLock.ts, platform.ts and utils.ts, so the directory stays.

How was this tested?

Verified nothing references the deleted modules before removing them:

$ grep -rn "LanguageSelector\|lib/i18n\|preloadLocales" . \
    --exclude-dir=node_modules --exclude-dir=out --exclude-dir=dist --exclude-dir=.git
(none)

Then, on a clean checkout of this branch:

Command	Result
npm run typecheck	clean (node + web + test)
npm run lint	0 errors, 109 warnings — the pre-existing count, unchanged
npm test	84 pass, 0 fail
npm run check:design	no violations
npm run build	succeeds (✓ built in 5.24s)

No UI or behaviour change, so there is nothing to screenshot.

Checklist

• I have reviewed my own changes.
• npm run typecheck passes.
• npm run build passes.
• I have tested the affected user workflow. — no user-facing workflow is affected; the modules had no callers
• I have not included unrelated changes.
• I have updated documentation when necessary. — no documentation referenced these modules

Desktop / build changes

• Not applicable