Add contractor sharing feature and move settings to navigation bar

Contractor Sharing:
- Add .casera file format for sharing contractors between users
- Create SharedContractor model with JSON serialization
- Implement ContractorSharingManager for iOS (Swift) and Android (Kotlin)
- Register .casera file type in iOS Info.plist and Android manifest
- Add share button to ContractorDetailView (iOS) and ContractorDetailScreen (Android)
- Add import confirmation, success, and error dialogs
- Create expect/actual platform implementations for sharing and import handling

Navigation Changes:
- Remove Profile tab from bottom tab bar (iOS and Android)
- Add settings gear icon to left side of "My Properties" title
- Settings gear opens Profile/Settings screen as sheet (iOS) or navigates (Android)
- Add property button to top right action bar

Bug Fixes:
- Fix ResidenceUsersResponse to match API's flat array response format
- Fix GenerateShareCodeResponse handling to access nested shareCode property
- Update ManageUsersDialog to accept residenceOwnerId parameter

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

composeApp/src/androidMain/kotlin/com/example/casera/MainActivity.kt

@@ -31,11 +31,14 @@ import com.example.casera.storage.ThemeStorageManager
 import com.example.casera.ui.theme.ThemeManager
 import com.example.casera.fcm.FCMManager
 import com.example.casera.platform.BillingManager
+import com.example.casera.network.APILayer
+import com.example.casera.sharing.ContractorSharingManager
 import kotlinx.coroutines.launch
 
 class MainActivity : ComponentActivity(), SingletonImageLoader.Factory {
     private var deepLinkResetToken by mutableStateOf<String?>(null)
     private var navigateToTaskId by mutableStateOf<Int?>(null)
+    private var pendingContractorImportUri by mutableStateOf<Uri?>(null)
     private lateinit var billingManager: BillingManager
 
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -55,9 +58,10 @@ class MainActivity : ComponentActivity(), SingletonImageLoader.Factory {
         // Initialize BillingManager for subscription management
         billingManager = BillingManager.getInstance(applicationContext)
 
-        // Handle deep link and notification navigation from intent
+        // Handle deep link, notification navigation, and file import from intent
         handleDeepLink(intent)
         handleNotificationNavigation(intent)
+        handleFileImport(intent)
 
         // Request notification permission and setup FCM
         setupFCM()
@@ -74,6 +78,10 @@ class MainActivity : ComponentActivity(), SingletonImageLoader.Factory {
                 navigateToTaskId = navigateToTaskId,
                 onClearNavigateToTask = {
                     navigateToTaskId = null
+                },
+                pendingContractorImportUri = pendingContractorImportUri,
+                onClearContractorImport = {
+                    pendingContractorImportUri = null
                 }
             )
         }
@@ -183,10 +191,21 @@ class MainActivity : ComponentActivity(), SingletonImageLoader.Factory {
         }
     }
 
+    override fun onResume() {
+        super.onResume()
+        // Check if lookups have changed on server (efficient ETag-based check)
+        // This ensures app has fresh data when coming back from background
+        lifecycleScope.launch {
+            Log.d("MainActivity", "🔄 App resumed, checking for lookup updates...")
+            APILayer.refreshLookupsIfChanged()
+        }
+    }
+
     override fun onNewIntent(intent: Intent) {
         super.onNewIntent(intent)
         handleDeepLink(intent)
         handleNotificationNavigation(intent)
+        handleFileImport(intent)
     }
 
     private fun handleNotificationNavigation(intent: Intent?) {
@@ -209,6 +228,16 @@ class MainActivity : ComponentActivity(), SingletonImageLoader.Factory {
         }
     }
 
+    private fun handleFileImport(intent: Intent?) {
+        if (intent?.action == Intent.ACTION_VIEW) {
+            val uri = intent.data
+            if (uri != null && ContractorSharingManager.isCaseraFile(applicationContext, uri)) {
+                Log.d("MainActivity", "Contractor file received: $uri")
+                pendingContractorImportUri = uri
+            }
+        }
+    }
+
     override fun newImageLoader(context: PlatformContext): ImageLoader {
         return ImageLoader.Builder(context)
             .components {