feat(viewer): add visual image rotation (90° steps)#3190
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Add rotate left/right buttons to the image viewer toolbar. Rotation is visual-only (CSS transform), no file modification. Buttons appear inline in the header for images (jpeg/png/webp). Rotation resets when navigating to next/previous image. Smooth 0.2s transition on rotate. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
Adds rotate left / rotate right buttons to the image viewer toolbar for JPEG, PNG and WebP files.
transform: rotate()— no file modificationMotivation
When a photo is taken or shared with incorrect orientation (e.g. portrait vs landscape), there is currently no way to adjust the view without leaving the viewer. This PR addresses issues #1846, #2804, #327, #65 with a minimal, non-destructive implementation.
Screenshots
Test plan
Notes
This is a visual-only rotation. It does not modify the file or EXIF data. A separate feature (with file write permission) could be added to persist the rotation — but that is out of scope for this PR.