cottongin a5ca15df4f feat: restore book cover/thumbnail prerender on first open ...

- Add isValidThumbnailBmp(), generateInvalidFormatCoverBmp(), and
  generateInvalidFormatThumbBmp() methods to Epub class for validating
  BMP files and generating X-pattern marker images when cover extraction
  fails (e.g., progressive JPG).
- Restore prerender block in EpubReaderActivity::onEnter() that checks
  for missing cover BMPs (fit + cropped) and thumbnail BMPs at each
  PRERENDER_THUMB_HEIGHTS size, showing a "Preparing book..." popup
  with progress. Falls back to PlaceholderCoverGenerator, then to
  invalid-format marker BMPs as last resort.

Made-with: Cursor

2026-03-07 21:22:19 -05:00

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