fix: back button in settings returns to tab bar first (#1354)
## Summary
- Pressing Back while browsing settings within a category now jumps
focus to the category tab bar
- Pressing Back again from the tab bar exits settings to home
- Previously, Back always exited directly to home regardless of scroll
position
Closes #797
## Test plan
- [ ] Scroll deep into a settings category → press Back → tab bar is
focused
- [ ] Press Back again from tab bar → exits to home screen
- [ ] Use category switching (continuous hold) → still works as before
- [ ] Settings are saved on exit (not on tab-bar jump)
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Co-authored-by: bkb <bkb@arcnode.xyz>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>