Add a "Manage Cache" item to the library Advanced Settings menu (native
mobile apps only) that opens a modern dialog showing the combined size and
file count of the app's reclaimable storage, with a confirm-gated clear that
reports per-file progress.
- iOS clears Cache + Temp + Documents/Inbox; Android clears Cache + Temp.
- Multi-source helper (getCacheEntries/getCacheStats/clearCacheEntries) with
unit tests; per-file failures are counted, never abort the run.
- Dialog uses the centered-hero + btn-contrast design language, theme-neutral
progress, and is e-ink correct.
- i18n: new strings translated across all locales (+ en plural forms).
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Huang Xin