Improve error message handling with user-friendly messages

- Add ErrorMessageParser in Kotlin and Swift to detect network errors
  and technical messages, replacing them with human-readable text
- Update all ViewModels to use ErrorMessageParser.parse() for error display
- Remove redundant error popup from LoginView (error shows inline only)

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

iosApp/iosApp/Residence/ResidenceDetailView.swift

@@ -468,7 +468,7 @@ private extension ResidenceDetailView {
             } catch {
                 await MainActor.run {
                     self.isDeleting = false
-                    self.viewModel.errorMessage = error.localizedDescription
+                    self.viewModel.errorMessage = ErrorMessageParser.parse(error.localizedDescription)
                 }
             }
         }
@@ -500,7 +500,7 @@ private extension ResidenceDetailView {
                 }
             } catch {
                 await MainActor.run {
-                    self.contractorsError = error.localizedDescription
+                    self.contractorsError = ErrorMessageParser.parse(error.localizedDescription)
                     self.isLoadingContractors = false
                 }
             }