Add delete account feature to mobile app

- DELETE /api/auth/account/ API call in AuthApi + APILayer
- authProvider field on User model for email vs social auth detection
- DeleteAccountDialog with password (email) or "type DELETE" (social) confirmation
- Red "Delete Account" card on ProfileScreen
- Navigation wired in App.kt (clears data, returns to login)
- 10 i18n strings in strings.xml
- ViewModel unit tests for delete account state

composeApp/src/commonMain/kotlin/com/tt/honeyDue/App.kt

@@ -665,6 +665,15 @@ fun App(
                             popUpTo<ProfileRoute> { inclusive = true }
                         }
                     },
+                    onAccountDeleted = {
+                        // Clear token and lookups on account deletion
+                        DataManager.clear()
+                        isLoggedIn = false
+                        isVerified = false
+                        navController.navigate(LoginRoute) {
+                            popUpTo<ProfileRoute> { inclusive = true }
+                        }
+                    },
                     onNavigateToNotificationPreferences = {
                         navController.navigate(NotificationPreferencesRoute)
                     },