feat: enhance error handling; implement copyable SnackBar for user messages across various screens

flutter/lib/core/api/api_error_mapper.dart

@@ -1,4 +1,5 @@
-import 'package:flutter/widgets.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 
 import '../l10n/l10n.dart';
 import 'api_exception.dart';
@@ -21,3 +22,18 @@ String mapErrorToUserMessage(Object error, BuildContext context) {
   }
   return l10n.unexpectedError;
 }
+
+SnackBar buildCopyableErrorSnackBar(BuildContext context, String message) {
+  return SnackBar(
+    content: Text(message),
+    action: SnackBarAction(
+      label: context.l10n.errorDialogCopy,
+      onPressed: () {
+        Clipboard.setData(ClipboardData(text: message));
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(content: Text(context.l10n.errorDialogCopied)),
+        );
+      },
+    ),
+  );
+}

flutter/lib/features/admin/presentation/admin_aliases_panel.dart

@@ -94,7 +94,7 @@ class _AdminAliasesPanelState extends ConsumerState<AdminAliasesPanel> {
     } catch (e) {
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(mapErrorToUserMessage(e, context))),
+        buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context))),
       );
     } finally {
       if (mounted) setState(() => _isSaving = false);
@@ -133,7 +133,7 @@ class _AdminAliasesPanelState extends ConsumerState<AdminAliasesPanel> {
     } catch (e) {
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(mapErrorToUserMessage(e, context))),
+        buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context))),
       );
     }
   }
@@ -259,3 +259,4 @@ class _AdminAliasesPanelState extends ConsumerState<AdminAliasesPanel> {
     return content;
   }
 }
+

flutter/lib/features/admin/presentation/admin_database_panel.dart

@@ -33,7 +33,7 @@ class _AdminDatabasePanelState extends ConsumerState<AdminDatabasePanel> {
     } catch (e) {
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(mapErrorToUserMessage(e, context))),
+        buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context))),
       );
     } finally {
       if (mounted) setState(() => _isRefreshingCategories = false);
@@ -180,3 +180,4 @@ class _AdminDatabasePanelState extends ConsumerState<AdminDatabasePanel> {
     );
   }
 }
+

flutter/lib/features/admin/presentation/admin_pending_products_panel.dart

@@ -57,7 +57,7 @@ class _AdminPendingProductsPanelState
     } catch (e) {
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(mapErrorToUserMessage(e, context))),
+        buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context))),
       );
     } finally {
       if (mounted) setState(() => _processingId = null);

flutter/lib/features/admin/presentation/admin_products_panel.dart

@@ -132,7 +132,7 @@ class _AdminProductsPanelState extends ConsumerState<AdminProductsPanel> {
     } catch (e) {
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(mapErrorToUserMessage(e, context))),
+        buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context))),
       );
     } finally {
       if (mounted) setState(() => _isApplying = false);
@@ -181,7 +181,7 @@ class _AdminProductsPanelState extends ConsumerState<AdminProductsPanel> {
     } catch (e) {
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(mapErrorToUserMessage(e, context))),
+        buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context))),
       );
     } finally {
       if (mounted) setState(() => _isAiRunning = false);
@@ -321,7 +321,7 @@ class _AdminProductsPanelState extends ConsumerState<AdminProductsPanel> {
     } catch (e) {
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(mapErrorToUserMessage(e, context))),
+        buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context))),
       );
     }
   }
@@ -358,7 +358,7 @@ class _AdminProductsPanelState extends ConsumerState<AdminProductsPanel> {
     } catch (e) {
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(mapErrorToUserMessage(e, context))),
+        buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context))),
       );
     }
   }
@@ -380,7 +380,7 @@ class _AdminProductsPanelState extends ConsumerState<AdminProductsPanel> {
     } catch (e) {
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(mapErrorToUserMessage(e, context))),
+        buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context))),
       );
     } finally {
       if (mounted) setState(() => _isApplying = false);
@@ -399,7 +399,7 @@ class _AdminProductsPanelState extends ConsumerState<AdminProductsPanel> {
     } catch (e) {
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(mapErrorToUserMessage(e, context))),
+        buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context))),
       );
     }
   }
@@ -435,7 +435,7 @@ class _AdminProductsPanelState extends ConsumerState<AdminProductsPanel> {
     } catch (e) {
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(mapErrorToUserMessage(e, context))),
+        buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context))),
       );
       setState(() => _rowCategorySaving.remove(product.id));
     }

flutter/lib/features/inventory/presentation/consume_inventory_screen.dart

@@ -52,7 +52,7 @@ class _ConsumeInventoryScreenState
     } catch (e) {
       if (mounted) {
         ScaffoldMessenger.of(context)
-            .showSnackBar(SnackBar(content: Text(mapErrorToUserMessage(e, context))));
+            .showSnackBar(buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context))));
       }
     } finally {
       if (mounted) setState(() => _saving = false);
@@ -139,3 +139,4 @@ class _ConsumeInventoryScreenState
     );
   }
 }
+

flutter/lib/features/inventory/presentation/create_inventory_screen.dart

@@ -1,4 +1,4 @@
-import 'package:flutter/material.dart';
+import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
@@ -76,7 +76,7 @@ class _CreateInventoryScreenState
       if (mounted) setState(() => _loadingProducts = false);
       if (mounted) {
         ScaffoldMessenger.of(context).showSnackBar(
-          SnackBar(content: Text(mapErrorToUserMessage(e, context))),
+          buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context))),
         );
       }
     }
@@ -136,7 +136,7 @@ class _CreateInventoryScreenState
     } catch (e) {
       if (mounted) {
         ScaffoldMessenger.of(context)
-            .showSnackBar(SnackBar(content: Text(mapErrorToUserMessage(e, context))));
+            .showSnackBar(buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context))));
       }
     } finally {
       if (mounted) setState(() => _saving = false);
@@ -326,3 +326,4 @@ class _CreateInventoryScreenState
     );
   }
 }
+

flutter/lib/features/inventory/presentation/inventory_detail_screen.dart

@@ -122,7 +122,7 @@ class _DeleteButton extends ConsumerWidget {
         } catch (e) {
           if (context.mounted) {
             ScaffoldMessenger.of(context).showSnackBar(
-              SnackBar(content: Text(mapErrorToUserMessage(e, context))),
+              buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context))),
             );
           }
         }
@@ -159,3 +159,4 @@ class _InfoRow extends StatelessWidget {
     );
   }
 }
+

flutter/lib/features/inventory/presentation/inventory_edit_screen.dart

@@ -111,7 +111,7 @@ class _InventoryEditScreenState extends ConsumerState<InventoryEditScreen> {
     } catch (e) {
       if (mounted) {
         ScaffoldMessenger.of(context)
-            .showSnackBar(SnackBar(content: Text(mapErrorToUserMessage(e, context))));
+            .showSnackBar(buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context))));
       }
     } finally {
       if (mounted) setState(() => _saving = false);
@@ -297,3 +297,4 @@ class _InventoryEditScreenState extends ConsumerState<InventoryEditScreen> {
     );
   }
 }
+

flutter/lib/features/inventory/presentation/swipeable_inventory_tile.dart

@@ -122,7 +122,7 @@ class _SwipeableInventoryTileState
     } catch (e) {
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(mapErrorToUserMessage(e, context))),
+        buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context))),
       );
     } finally {
       if (mounted) setState(() => _acting = false);
@@ -372,7 +372,7 @@ class _DeleteButton extends ConsumerWidget {
               ref.invalidate(inventoryProvider);
             } catch (e) {
               ScaffoldMessenger.of(context).showSnackBar(
-                SnackBar(content: Text(mapErrorToUserMessage(e, context))),
+                buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context))),
               );
             }
           }
@@ -381,3 +381,4 @@ class _DeleteButton extends ConsumerWidget {
     );
   }
 }
+

flutter/lib/features/meal_plan/presentation/meal_plan_screen.dart

@@ -56,7 +56,7 @@ class _MealPlanScreenState extends ConsumerState<MealPlanScreen> {
     } catch (error) {
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(mapErrorToUserMessage(error, context))),
+        buildCopyableErrorSnackBar(context, mapErrorToUserMessage(error, context))),
       );
     } finally {
       if (mounted) {

flutter/lib/features/pantry/presentation/pantry_screen.dart

@@ -166,7 +166,7 @@ class _PantryScreenState extends ConsumerState<PantryScreen> {
       _logger.severe('Failed to add item to inventory: $error');
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(mapErrorToUserMessage(error, context))),
+        buildCopyableErrorSnackBar(context, mapErrorToUserMessage(error, context))),
       );
     }
   }
@@ -185,7 +185,7 @@ class _PantryScreenState extends ConsumerState<PantryScreen> {
       _logger.severe('Failed to add pantry item: $error');
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(mapErrorToUserMessage(error, context))),
+        buildCopyableErrorSnackBar(context, mapErrorToUserMessage(error, context))),
       );
     } finally {
       if (mounted) setState(() => _isSubmitting = false);
@@ -221,7 +221,7 @@ class _PantryScreenState extends ConsumerState<PantryScreen> {
       _logger.severe('Failed to remove pantry item: $error');
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(mapErrorToUserMessage(error, context))),
+        buildCopyableErrorSnackBar(context, mapErrorToUserMessage(error, context))),
       );
     }
   }
@@ -419,3 +419,4 @@ class _PantryScreenState extends ConsumerState<PantryScreen> {
     );
   }
 }
+

flutter/lib/features/profile/presentation/profile_screen.dart

@@ -85,7 +85,7 @@ class _ProfileScreenState extends ConsumerState<ProfileScreen> {
     } catch (e) {
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(mapErrorToUserMessage(e, context))),
+        buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context))),
       );
     } finally {
       if (mounted) setState(() => _isSaving = false);
@@ -288,3 +288,4 @@ class _ProfileScreenState extends ConsumerState<ProfileScreen> {
     );
   }
 }
+

flutter/lib/features/recipes/presentation/recipe_detail_screen.dart

@@ -193,7 +193,7 @@ class RecipeDetailScreen extends ConsumerWidget {
     } on ApiException catch (e) {
       if (!context.mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(mapErrorToUserMessage(e, context))),
+        buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context))),
       );
     }
   }
@@ -281,7 +281,7 @@ class RecipeDetailScreen extends ConsumerWidget {
     } on ApiException catch (e) {
       if (!context.mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(mapErrorToUserMessage(e, context))),
+        buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context))),
       );
     }
   }
@@ -353,7 +353,7 @@ class _DeleteButton extends ConsumerWidget {
     } on ApiException catch (e) {
       if (!context.mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(mapErrorToUserMessage(e, context))),
+        buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context))),
       );
     }
   }
@@ -697,3 +697,4 @@ class _IngredientPreviewRow extends StatelessWidget {
     );
   }
 }
+

flutter/lib/main.dart

@@ -17,6 +17,9 @@ class RecipeApp extends ConsumerWidget {
     final router = ref.watch(appRouterProvider);
     return MaterialApp.router(
       onGenerateTitle: (context) => context.l10n.appTitle,
+      builder: (context, child) {
+        return SelectionArea(child: child ?? const SizedBox.shrink());
+      },
       theme: ThemeData(
         colorScheme: ColorScheme.fromSeed(seedColor: Colors.green),
         useMaterial3: true,