Add comprehensive error message parsing to prevent raw JSON display

- Created ErrorMessageParser utility for both iOS (Swift) and Android (Kotlin)
- Parser detects JSON-formatted error messages and extracts user-friendly text
- Identifies when data objects (not errors) are returned and provides generic messages
- Updated all API error handling to pass raw error bodies instead of concatenating
- Applied ErrorMessageParser across all ViewModels and screens on both platforms
- Fixed ContractorApi and DocumentApi to not concatenate error bodies with messages
- Updated ApiResultHandler to automatically parse all error messages
- Error messages now show "Request failed. Please check your input and try again." instead of raw JSON

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

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

iosApp/iosApp/Residence/JoinResidenceView.swift

@@ -89,7 +89,7 @@ struct JoinResidenceView: View {
                     break
                 } else if let error = state as? ApiResultError {
                     await MainActor.run {
-                        viewModel.errorMessage = error.message
+                        viewModel.errorMessage = ErrorMessageParser.parse(error.message)
                         viewModel.sharedViewModel.resetJoinResidenceState()
                     }
                     break

iosApp/iosApp/Residence/ManageUsersView.swift

@@ -100,7 +100,7 @@ struct ManageUsersView: View {
                         self.ownerId = responseData.ownerId as? Int32
                         self.isLoading = false
                     } else if let errorResult = result as? ApiResultError {
-                        self.errorMessage = errorResult.message
+                        self.errorMessage = ErrorMessageParser.parse(errorResult.message)
                         self.isLoading = false
                     } else {
                         self.errorMessage = "Failed to load users"
@@ -149,7 +149,7 @@ struct ManageUsersView: View {
                         self.shareCode = successResult.data
                         self.isGeneratingCode = false
                     } else if let errorResult = result as? ApiResultError {
-                        self.errorMessage = errorResult.message
+                        self.errorMessage = ErrorMessageParser.parse(errorResult.message)
                         self.isGeneratingCode = false
                     } else {
                         self.errorMessage = "Failed to generate share code"
@@ -177,7 +177,7 @@ struct ManageUsersView: View {
                         // Remove user from local list
                         self.users.removeAll { $0.id == userId }
                     } else if let errorResult = result as? ApiResultError {
-                        self.errorMessage = errorResult.message
+                        self.errorMessage = ErrorMessageParser.parse(errorResult.message)
                     } else {
                         self.errorMessage = "Failed to remove user"
                     }

iosApp/iosApp/Residence/ResidenceDetailView.swift

@@ -148,6 +148,10 @@ struct ResidenceDetailView: View {
         .onAppear {
             loadResidenceData()
         }
+        .handleErrors(
+            error: viewModel.errorMessage,
+            onRetry: { loadResidenceData() }
+        )
     }
 }
 
@@ -158,10 +162,6 @@ private extension ResidenceDetailView {
     var mainContent: some View {
         if !hasAppeared || viewModel.isLoading {
             loadingView
-        } else if let error = viewModel.errorMessage {
-            ErrorView(message: error) {
-                loadResidenceData()
-            }
         } else if let residence = viewModel.selectedResidence {
             contentView(for: residence)
         }
@@ -328,7 +328,7 @@ private extension ResidenceDetailView {
                     if result is ApiResultSuccess<KotlinUnit> {
                         dismiss()
                     } else if let errorResult = result as? ApiResultError {
-                        self.viewModel.errorMessage = errorResult.message
+                        self.viewModel.errorMessage = ErrorMessageParser.parse(errorResult.message)
                     } else {
                         self.viewModel.errorMessage = "Failed to delete residence"
                     }

iosApp/iosApp/Residence/ResidenceViewModel.swift

@@ -44,7 +44,7 @@ class ResidenceViewModel: ObservableObject {
                     break
                 } else if let error = state as? ApiResultError {
                     await MainActor.run {
-                        self.errorMessage = error.message
+                        self.errorMessage = ErrorMessageParser.parse(error.message)
                         self.isLoading = false
                     }
                     break
@@ -74,7 +74,7 @@ class ResidenceViewModel: ObservableObject {
                     break
                 } else if let error = state as? ApiResultError {
                     await MainActor.run {
-                        self.errorMessage = error.message
+                        self.errorMessage = ErrorMessageParser.parse(error.message)
                         self.isLoading = false
                     }
                     break
@@ -93,7 +93,7 @@ class ResidenceViewModel: ObservableObject {
                     self.selectedResidence = success.data
                     self.isLoading = false
                 } else if let error = result as? ApiResultError {
-                    self.errorMessage = error.message
+                    self.errorMessage = ErrorMessageParser.parse(error.message)
                     self.isLoading = false
                 }
             }
@@ -122,7 +122,7 @@ class ResidenceViewModel: ObservableObject {
                     break
                 } else if let error = state as? ApiResultError {
                     await MainActor.run {
-                        self.errorMessage = error.message
+                        self.errorMessage = ErrorMessageParser.parse(error.message)
                         self.isLoading = false
                     }
                     sharedViewModel.resetCreateState()
@@ -156,7 +156,7 @@ class ResidenceViewModel: ObservableObject {
                     break
                 } else if let error = state as? ApiResultError {
                     await MainActor.run {
-                        self.errorMessage = error.message
+                        self.errorMessage = ErrorMessageParser.parse(error.message)
                         self.isLoading = false
                     }
                     sharedViewModel.resetUpdateState()

iosApp/iosApp/Residence/ResidencesListView.swift

@@ -19,10 +19,6 @@ struct ResidencesListView: View {
                         .font(.body)
                         .foregroundColor(Color(.secondaryLabel))
                 }
-            } else if let error = viewModel.errorMessage {
-                ErrorView(message: error) {
-                    viewModel.loadMyResidences()
-                }
             } else if let response = viewModel.myResidences {
                 if response.residences.isEmpty {
                     EmptyResidencesView()
@@ -100,6 +96,10 @@ struct ResidencesListView: View {
         .onAppear {
             viewModel.loadMyResidences()
         }
+        .handleErrors(
+            error: viewModel.errorMessage,
+            onRetry: { viewModel.loadMyResidences() }
+        )
     }
 }