fix: enable MOBI and AZW vectorization on mobile

[cha1latte]

What changed

• enables manual and automatic vectorization for DRM-free MOBI, AZW, and AZW3 books on mobile
• replaces duplicated format allowlists with one capability owner and preserves stored format/filename context through the WebView reader
• rejects protected PalmDOC/MOBI records before extraction; no decryption or DRM bypass is added
• distinguishes protected, malformed, unsupported, and unknown extraction failures with localized messages
• adds real queued/active cancellation through extraction, embedding, and persistence, with cleanup before any terminal success/cancel state
• makes vectorization completion database-first on mobile and desktop so persistence failures cannot produce a false Indexed state
• isolates concurrent reader extraction sessions so one book can never receive another book's chapters

Root cause

ReadAny's bundled Foliate parser already understands DRM-free MOBI/KF8, but the mobile vectorization entry points only allowed EPUB/PDF/TXT/UMD and lost the book-format hint when files arrived as generic binary data. The existing lifecycle also needed stricter failure, persistence, and cancellation boundaries before these formats could be enabled safely.

Real-book proof

The regression suite includes official Project Gutenberg ebook 11 fixtures for MOBI v6 and KF8/AZW3. Their source URLs, sizes, SHA-256 values, retrieval date, and public-domain/license context are recorded beside the fixtures. Tests run the real Foliate parser/decompressor, assert ordered Alice text, and prove a synthetic nonzero-encryption header is rejected without decryption.

Validation

• TZ=UTC pnpm --filter @readany/core test ? 600 passed
• TZ=UTC pnpm --filter @readany/app-expo test ? 100 passed
• pnpm --filter @readany/app-expo exec tsc --noEmit
• pnpm --filter @readany/app-expo build:reader ? deterministic generated output
• pnpm --filter app build
• targeted Biome ? 45 changed files clean; documented pre-existing warnings/format noise excluded in four legacy/vendor files
• git diff --check upstream/main...HEAD
• independent final review ? no Critical, Important, or Minor findings

Scope and limitations

• DRM-free MOBI, AZW, and AZW3 only
• KFX and protected Kindle books remain unsupported
• embedding providers, chunk sizes, ranking, retrieval, and search behavior are unchanged

Manual acceptance still pending

The implementation and automated real-book coverage are ready for maintainer review. A live Android acceptance pass remains pending for real MOBI/AZW3 import, manual and automatic vectorization, grounded answers, protected-file messaging, queued/active cancellation, and absence of partial searchable residue after cancellation.