cottongin e387976220 feat: replace JPEGDEC with stb_image for robust JPEG decoding ...

JPEGDEC (error 3: UNSUPPORTED_FEATURE) and M5GFX's TJpgDec both failed
on ~70% of Immich preview images due to:
- Optimized Huffman tables exceeding 12-bit DC code limit
- Extended sequential mode (SOF1) misidentified as baseline
- Progressive JPEG not handled by either decoder

stb_image.h handles all standard JPEG modes (baseline, progressive,
extended sequential, arbitrary Huffman tables) in a single decoder.

Changes:
- Add vendored stb_image.h (JPEG-only, PSRAM allocator)
- Rewrite decodeAndFit() to use stbi_load_from_memory()
- Remove JPEGDEC library dependency
- Remove jpegDrawCallback, DecodeContext, parseJpegHeader,
  decodeFallbackLGFX (all obsolete)
- Flash usage decreased: 1345KB -> 1317KB

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

2026-08-03 20:22:06 -04:00

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