Add residence sharing via .casera files

- Add SharedResidence model and package type detection for .casera files
- Add generateSharePackage API endpoint integration
- Create ResidenceSharingManager for iOS and Android
- Add share button to residence detail screens (owner only)
- Add residence import handling with confirmation dialogs
- Update Quick Look extensions to show house icon for residence packages
- Route .casera imports by type (contractor vs residence)

🤖 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

@@ -35,12 +35,15 @@ import com.example.casera.network.APILayer
 import com.example.casera.sharing.ContractorSharingManager
 import com.example.casera.data.DataManager
 import com.example.casera.data.PersistenceManager
+import com.example.casera.models.CaseraPackageType
+import com.example.casera.models.detectCaseraPackageType
 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 var pendingResidenceImportUri by mutableStateOf<Uri?>(null)
     private lateinit var billingManager: BillingManager
 
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -92,6 +95,10 @@ class MainActivity : ComponentActivity(), SingletonImageLoader.Factory {
                 pendingContractorImportUri = pendingContractorImportUri,
                 onClearContractorImport = {
                     pendingContractorImportUri = null
+                },
+                pendingResidenceImportUri = pendingResidenceImportUri,
+                onClearResidenceImport = {
+                    pendingResidenceImportUri = null
                 }
             )
         }
@@ -242,8 +249,35 @@ class MainActivity : ComponentActivity(), SingletonImageLoader.Factory {
         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
+                Log.d("MainActivity", "Casera file received: $uri")
+
+                // Read file content to detect package type
+                try {
+                    val inputStream = contentResolver.openInputStream(uri)
+                    if (inputStream != null) {
+                        val jsonString = inputStream.bufferedReader().use { it.readText() }
+                        inputStream.close()
+
+                        val packageType = detectCaseraPackageType(jsonString)
+                        Log.d("MainActivity", "Detected package type: $packageType")
+
+                        when (packageType) {
+                            CaseraPackageType.RESIDENCE -> {
+                                Log.d("MainActivity", "Routing to residence import")
+                                pendingResidenceImportUri = uri
+                            }
+                            else -> {
+                                // Default to contractor for backward compatibility
+                                Log.d("MainActivity", "Routing to contractor import")
+                                pendingContractorImportUri = uri
+                            }
+                        }
+                    }
+                } catch (e: Exception) {
+                    Log.e("MainActivity", "Failed to detect package type, defaulting to contractor", e)
+                    // Default to contractor on error for backward compatibility
+                    pendingContractorImportUri = uri
+                }
             }
         }
     }