[Namnarak]

Summary

Closes the remaining English UI coverage gaps reported in #11.

• Add a shared Thai/English translation context with interpolation and tests.
• Apply English labels across navigation, chat list, conversation controls, history recovery, Full Sync, New Chat, friend/group management, profile, sync diagnostics, settings pages, Notes, Albums, Image Viewer, and Flex/Rich fallback controls.
• Preserve LINE-provided names, message bodies, album titles, note text, explicit Flex action labels, and other user-authored/external content rather than translating their contents.
• Format Friend Sync counts/dates for the selected language.

Validation

• npm run electron:web — passed.
• npm test — 200 passed, 0 failed (568 assertions).
• npm run lint — 0 errors; 15 warnings remain.
• Static translation audit — 457 t() call keys, 0 missing, 0 duplicate dictionary keys.
• git diff --check — passed.

This PR does not change the app version or create a release. It is intended for the next Electron preview build so Issue #11 can be retested in the actual desktop app.

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View logs

[Namnarak]

Merged into master on 2026-11-06 via merge commit 91eb16807508074df281e119b09416acdc29e8f1. This brings the shared Thai/English translation layer and the expanded English UI coverage into the main branch. Validation before merge: 200 tests passed, production Electron build passed, and the static translation audit found 0 missing keys and 0 duplicate dictionary keys. Issue #11 remains open only for the final visual review of the packaged desktop app; this merge does not claim that manual review is complete.