feat: include EXIF preference toggle in settings and gallery creation
Add "Include camera data (EXIF) when uploading" toggle to Settings,
synced with the server via dev.hatk.putPreference (same key as web).
Gallery creation now respects this preference, skipping EXIF record
creation when disabled.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>