cottongin 61fb11cae3 feat: Add PNG cover image support for EPUB books (#827) ...

Cherry-pick upstream PR #827 with conflict resolution for mod/master:

- Add PngToBmpConverter library for PNG cover → BMP conversion
- Add PNG thumbnail generation in generateThumbBmp()
- Fix generateCoverBmp() PNG block to use effectiveCoverImageHref
  (consistent with mod's fallback cover candidate probing)
- Add .png to getCoverCandidates() extensions
- Use LOG_ERR macro in ImageToFramebufferDecoder (mod standard)
- Upstream image converter refinements (ImageBlock, PixelCache,
  JpegToFramebufferConverter, PngToFramebufferConverter)

Co-authored-by: Cursor <cursoragent@cursor.com>

2026-02-16 17:04:33 -05:00

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