feat(i18n): localize onboarding & reports; logout

- 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

assets/lang/en.json

@@ -97,5 +97,60 @@
   "auth.title": "Sign in",
   "auth.signInWithApple": "Sign in with Apple",
   "auth.signInWithGoogle": "Sign in with Google",
-  "auth.comingSoon": "Coming soon"
+  "auth.comingSoon": "Coming soon",
+  "welcome.title": "Spot it. Snap it. Fix it.",
+  "welcome.subtitle": "Report city issues in seconds with AI-powered detection. Help create safer, better communities together.",
+  "cta.continueGuest": "Continue as Guest",
+  "cta.signIn": "Sign In",
+  "cta.skip": "Skip for now",
+  "onboarding.header": "Welcome to FixMate",
+  "onboarding.title1": "Fast Issue Reporting",
+  "onboarding.subtitle1": "AI-Powered Detection",
+  "onboarding.body1": "Simply take a photo of any urban issue - our AI automatically identifies and categorizes the problem in seconds.",
+  "onboarding.title2": "Smart City Mapping",
+  "onboarding.subtitle2": "Real-Time Visualization",
+  "onboarding.body2": "View all reported issues on an interactive map with intelligent clustering and filtering options.",
+  "onboarding.title3": "Track Progress",
+  "onboarding.subtitle3": "Stay Informed",
+  "onboarding.body3": "Follow the status of your reports from submission to resolution. Help make your community better.",
+  "onboarding.skip": "Skip",
+  "onboarding.next": "Next",
+  "onboarding.getStarted": "Get Started",
+  "review.title": "Review & Submit",
+  "review.submit": "Submit",
+  "review.aiAnalysis": "AI Analysis Complete",
+  "review.aiConfidence": "Smart detection with {0}% confidence",
+  "review.useSuggestion": "Use AI Suggestion",
+  "review.editManually": "Edit Manually",
+  "review.category": "Issue Category",
+  "review.severity": "Severity Level",
+  "review.notes": "Additional Notes",
+  "review.notesHint": "Add any additional details or context...",
+  "review.location": "Location Details",
+  "review.coordinates": "Coordinates",
+  "review.accuracy": "Accuracy: {0}m",
+  "error.saving": "Error saving report: {0}",
+  "error.imagePick": "Error picking image: {0}",
+  "error.location": "Unable to get location. Please try again.",
+  "error.imageProcessing": "Error processing image: {0}",
+  "capture.title": "Report Issue",
+  "capture.subtitle": "Report City Issues",
+  "capture.description": "Take a photo of any urban maintenance issue like potholes, broken streetlights, or damaged signage.",
+  "capture.processing": "Processing image...",
+  "capture.takePhoto": "Take Photo",
+  "capture.gallery": "Choose from Gallery",
+  "report.viewDetails": "View Details",
+  "report.updateStatus": "Update Status",
+  "report.delete": "Delete",
+  "report.comingSoon": "Coming Soon!",
+  "settings.loading": "Loading...",
+  "settings.app": "App",
+  "settings.version": "v1.0.0",
+  "settings.account": "Account",
+  "settings.account.guest": "Guest Mode",
+  "btn.logout": "Logout",
+  "confirm.logout.title": "Logout?",
+  "confirm.logout.message": "You will be returned to the welcome screen.",
+  "label.createdAt": "Created At",
+  "error.clearData": "Failed to clear data"
 }