Implement automatic generation of multiple image sizes for responsive
delivery and enhanced feed optimization.
Changes:
- Add migration 009 for media_variants table with CASCADE delete
- Define variant specs: thumb (150x150 crop), small (320px), medium (640px), large (1280px)
- Implement generate_variant() with center crop for thumbnails and aspect-preserving resize
- Implement generate_all_variants() with try/except cleanup, pass year/month/optimized_bytes explicitly
- Update save_media() to generate all variants after saving original
- Update get_note_media() to include variants dict (backwards compatible - only when variants exist)
- Record original as 'original' variant type
Technical details:
- Variants use explicit year/month parameters to avoid fragile path traversal
- Pass optimized_bytes to avoid redundant file I/O
- File cleanup on variant generation failure
- Skip generating variants larger than source image
- variants key only added to response when variants exist (pre-v1.4.0 compatibility)
All existing tests pass. Phase 2 complete.
Per design document: /home/phil/Projects/starpunk/docs/design/v1.4.0/media-implementation-design.md
Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
