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Media: Add JPEG XL (JXL) upload support with companion-original preservation (backport GB #77584) - #12006

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Media: Add JPEG XL (JXL) upload support with companion-original preservation (backport GB #77584)#12006
adamsilverstein wants to merge 16 commits into
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adamsilverstein:backport/77584-jxl-lazy-load

Commits on Mar 20, 2026
- Media: Allow HEIC/HEIF uploads when server lacks support
  adamsilverstein
  committed
  bf9f644
Commits on Apr 22, 2026
- Merge remote-tracking branch 'origin/trunk' into add/heic-canvas-fallback
  adamsilverstein
  committed
  71a9e8b
Commits on May 28, 2026
Commits on Jun 18, 2026
- Tests: Regenerate REST API client fixture for the original-jxl sub-size.
  adamsilverstein
  committed
  128268d
Commits on Jun 27, 2026
- Media: Store the JXL companion under source_image and drop the duplicate delete
  adamsilverstein
  committed
  c8048fa
Commits on Sep 18, 2026
- Merge remote-tracking branch 'origin/trunk' into wt/12006-jxl
  adamsilverstein
  committed
  a43c3a5
- REST API: Drop the unused sideload generate_sub_sizes argument
  
  adamsilverstein
  and
  claude
  committed
  570ea1f
- REST API: Drop the HEIC upload bypass from the JXL backport
  
  adamsilverstein
  and
  claude
  committed
  d90af70
- Tests: Remove a stray blank line left by the JXL test cleanup
  
  adamsilverstein
  and
  claude
  committed
  19ffd09
- Tests: Restore the image_output_formats REST index fixture entry
  
  adamsilverstein
  and
  claude
  committed
  2716958