Settings now persist across app restarts via SecureStore:
- Theme (KaizenThemeId), appearance (Light/Dark/System), username, locale
- All loaded on SettingsViewModel init, saved on every change
Server sync: fetchMe() returns name + email from /api/v1/me,
populates SettingsViewModel on login and each foreground resume.
Language selector: System / Deutsch / English pill toggle in Settings.
Locale preference stored; runtime switching deferred to next iteration.
MeResponse expanded to parse name + email (was defaultModel only).
SettingsViewModel tests updated for store-less default state.
Inter Variable (v4.1, 859 KB): full type scale with 9 weight axes
(W100–W900), negative tracking at display sizes, positive at labels.
Theme picker: SettingsViewModel now uses KaizenThemeId from the design
system (AMBER/BLAU/MONO/AURORA). MainActivity wires selectedTheme +
appearanceMode to KaizenTheme composable — switching themes in Settings
instantly propagates to the entire app.
No server sync needed — web stores theme in localStorage, app stores
locally. Backend /api/v1/me has no uiTheme field in the DB.
Settings strings migrated to string resources (de + en).
SettingsViewModelTest updated for new enum values + System default.
