- add en/ms keys for welcome, onboarding, capture/review, errors, and
settings labels
- replace hardcoded strings with I18n.t in WelcomeScreen, OnboardingFlow,
CaptureScreen, ReviewScreen, Map severity legend, and Settings
- update StartRouter: onboarded guests go to MainScreen; non-guest users
see SignIn; skip marks user as onboarded guest
- add logout action in Settings that clears onboarding/user mode prefs
and returns to the welcome flow
- refine settings diagnostics and app section; move labels to i18n
- leave TODOs for app subtitle, processing status, and ReportCard menu
labels for future i18n coverage
- integrate flutter_localizations and delegates in MaterialApp
- use language-only supportedLocales; add resolution callback
- initialize I18n on app start and when switching language
- localize capture screen prompt via I18n.t
- schedule map centering via postFrame to avoid race conditions
- add flutter_localizations to pubspec
Introduce StartRouter to gate first run with onboarding. Persist state in
SharedPreferences (onboarded_v1). Add WelcomeScreen, a 3-step
OnboardingFlow, and a SignInScreen placeholder with Apple/Google buttons
and "coming soon" toasts plus continue as guest.
Apply new AppThemes (light/dark, high-contrast option) built from design
tokens and wire into MaterialApp (theme/darkTheme, system mode). Add
ThemeProvider to persist ThemeMode and high-contrast flags (not yet
hooked into the tree).
Add EN/MS i18n strings for welcome, onboarding, auth, and CTAs. Include
assets/tokens/design-tokens.json for design tooling parity.
