* fix(ux): keep Settings highlighted in bottom nav on drill-down sub-pages (issue #637)
Map Settings drill-down destinations (SettingsConnection, SettingsAppearance, SettingsChat, SettingsNavBar, SettingsBehavior, SettingsAbout) back to SettingsScreen for bottom-nav selection only - navigation is unaffected.
- Add selectedBottomNavDestination() helper in Navigation.kt
- Extract bar-height logic into Modifier.bottomNavigationHeight() (ICON_AND_TEXT now uses heightIn(min=80.dp) so the standard bar can grow)
- BottomNavigationSelectionTest (JVM): selection mapping logic
- BottomNavigationLayoutTest (androidTest): per-mode bar height assertions
* docs(navigation): warn that new Settings sub-pages must be added to settingsDestinations
Addresses agy review (PR #643): documents the fragility of the hardcoded settingsDestinations set so future Settings drill-down screens don't silently drop the bottom-nav highlight. The sealed-class/marker-interface refactor was declined as scope creep (issue #637 explicitly scopes Settings-only; keys are flat data objects).
* fix: language selector
---------
Co-authored-by: M57 <Hy4ri@users.noreply.github.com>
