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>

iosApp/iosApp/MainTabView.swift

@@ -47,16 +47,6 @@ struct MainTabView: View {
             }
             .tag(3)
             .accessibilityIdentifier(AccessibilityIdentifiers.Navigation.documentsTab)
-
-            NavigationView {
-                ProfileTabView()
-            }
-            .id(refreshID)
-            .tabItem {
-                Label("Profile", systemImage: "person.fill")
-            }
-            .tag(4)
-            .accessibilityIdentifier(AccessibilityIdentifiers.Navigation.profileTab)
         }
         .tint(Color.appPrimary)
         .onChange(of: authManager.isAuthenticated) { _ in