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>

iosApp/CaseraQLThumbnail/ThumbnailProvider.swift

@@ -10,19 +10,37 @@ import QuickLookThumbnailing
 
 class ThumbnailProvider: QLThumbnailProvider {
 
+    /// Represents the type of .casera package
+    private enum PackageType {
+        case contractor
+        case residence
+    }
+
     override func provideThumbnail(for request: QLFileThumbnailRequest, _ handler: @escaping (QLThumbnailReply?, Error?) -> Void) {
 
         let thumbnailSize = request.maximumSize
 
+        // Detect package type from file
+        let packageType = detectPackageType(at: request.fileURL)
+
         handler(QLThumbnailReply(contextSize: thumbnailSize, currentContextDrawing: { () -> Bool in
             // Draw background
             let backgroundColor = UIColor(red: 7/255, green: 160/255, blue: 195/255, alpha: 1)
             backgroundColor.setFill()
             UIRectFill(CGRect(origin: .zero, size: thumbnailSize))
 
+            // Choose icon based on package type
+            let iconName: String
+            switch packageType {
+            case .contractor:
+                iconName = "person.crop.rectangle.stack"
+            case .residence:
+                iconName = "house.fill"
+            }
+
             // Draw icon
             let config = UIImage.SymbolConfiguration(pointSize: min(thumbnailSize.width, thumbnailSize.height) * 0.5, weight: .regular)
-            if let icon = UIImage(systemName: "person.crop.rectangle.stack", withConfiguration: config) {
+            if let icon = UIImage(systemName: iconName, withConfiguration: config) {
                 let tintedIcon = icon.withTintColor(.white, renderingMode: .alwaysOriginal)
                 let iconSize = tintedIcon.size
                 let iconOrigin = CGPoint(
@@ -35,4 +53,19 @@ class ThumbnailProvider: QLThumbnailProvider {
             return true
         }), nil)
     }
+
+    /// Detects the package type by reading the "type" field from the JSON
+    private func detectPackageType(at url: URL) -> PackageType {
+        do {
+            let data = try Data(contentsOf: url)
+            if let json = try JSONSerialization.jsonObject(with: data) as? [String: Any],
+               let typeString = json["type"] as? String,
+               typeString == "residence" {
+                return .residence
+            }
+        } catch {
+            // Default to contractor on error
+        }
+        return .contractor
+    }
 }