Word Hunter 1.1.0-rc.4

Word Hunter 1.1.0-rc.4

Fourth release candidate of the 1.1.0 line: reader follow-along, flashcard
quality-of-life (shuffle + separable-verb masking), deletion feedback,
first-run language prompt fix, bundled accessible fonts, and a focused
Discovery catalog.

Changes since 1.1.0-rc.3

• Read-along stays visible — while TTS reads the page, a watchdog keeps
  the highlighted word inside the viewport even after manual scrolling or
  layout shifts; word tracking now resyncs after an unmatched spoken token
  instead of freezing off-screen.
• Flashcard shuffle — new header button shuffles the remaining cards
  scheduled for today and restarts at the first card of the new order.
• German separable verbs masked on cards (#278) — reverse flashcards hide
  both parts ("rief … an") across the clause while keeping the words between
  them readable.
• Deletion busy indicator — removing a book keeps its confirmation dialog
  open with spinner/disabled buttons until the durable save settles; the
  dialog cannot be dismissed mid-delete.
• Language prompt only on first start — the Android language onboarding no
  longer re-shows on every launch/reload: the decision waits for the store
  snapshot and the confirmation flag survives late snapshot replaces.
• Reader fonts for dyslexia — bundled Atkinson Hyperlegible and OpenDyslexic
  (both SIL OFL 1.1) selectable in Settings → Reader font.
• Discovery: wiki sources removed — Wikipedia/Wikinews/Wikisource produced
  short, chaotic stubs unsuitable for long-form learning; Discovery now focuses
  on Project Gutenberg. Persisted selections migrate to Gutenberg automatically;
  already-imported wiki texts remain fully readable.
• Android install guidance — README documents why an APK may report
  "App not installed" (signature mismatch or versionCode downgrade) and how to
  upgrade safely.

Verification

• Frontend: npm run check:frontend exit 0, npm run test:frontend
  684/684 PASS (+1 skipped pre-existing).
• Version sinks: scripts/check-version-sinks.sh OK at 1.1.0-rc.4.
• Android versionCode monotonicity: 101100004 > published 101100003.