fix: UI polish — destructive styling, story cache, settings labels
- Make delete gallery and block button red (icon + text)
- Make mute button non-destructive
- Remove double-tap-to-fav on stories
- Fix story ring not clearing after deleting last story
- Re-fetch story strip on viewer dismiss
- Filter out authors with 0 stories from strip and cache
- Rename settings: Appearance → Feeds, Upload Defaults → Privacy
- Add "Defaults for new uploads" section header
- Add long-press to copy handle/DID on account settings
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>