feat: enhance category picker functionality with preselection support and new existing category picker

flutter/lib/features/import/presentation/receipt_import_tab.dart

@@ -125,11 +125,12 @@ class _EditDialogState extends State<_EditDialog> {
     super.dispose();
   }
 
-  Future<void> _openCreateCategoryPicker() async {
+  Future<void> _openCreateCategoryPicker({int? preselectedCategoryId}) async {
     final selected = await CategoryThenProductPicker.showCategorySheet(
       context,
       categoryTree: widget.categoryTree,
-      preselectedCategoryId: _newCategoryId ?? widget.item.categorySuggestionId,
+      preselectedCategoryId:
+          preselectedCategoryId ?? _newCategoryId ?? widget.item.categorySuggestionId,
     );
     if (selected == null || !mounted) return;
     setState(() {
@@ -139,6 +140,41 @@ class _EditDialogState extends State<_EditDialog> {
     });
   }
 
+  Future<void> _openExistingCategoryPicker({int? preselectedCategoryId}) async {
+    Future<ProductOption?> Function(String, int)? onCreateWrapped;
+    if (widget.onCreate != null) {
+      onCreateWrapped = (name, categoryId) async {
+        final newProduct = await widget.onCreate!(name, categoryId);
+        if (newProduct != null && mounted) {
+          setState(() => _localProducts = [..._localProducts, newProduct]);
+        }
+        return newProduct;
+      };
+    }
+
+    final id = await CategoryThenProductPicker.show(
+      context,
+      categoryTree: widget.categoryTree,
+      products: _localProducts,
+      currentProductId: _productId,
+      preselectedCategoryId: preselectedCategoryId,
+      initialQuery: widget.item.rawName,
+      onCreate: onCreateWrapped,
+    );
+    if (id != null && mounted) {
+      setState(() {
+        _productId = id;
+        _productName = _localProducts
+            .cast<ProductOption?>()
+            .firstWhere((p) => p?.id == id, orElse: () => null)
+            ?.name;
+        _productCategoryId = _categoryIdForProduct(id);
+        _productCategoryPath = _categoryPathForCategoryId(_productCategoryId);
+        _productCategorySource = CategorySelectionSource.manual;
+      });
+    }
+  }
+
   bool get _canConfirm {
     if (_entryMode == _ProductEntryMode.create) {
       return !_isCreatingProduct &&
@@ -193,66 +229,9 @@ class _EditDialogState extends State<_EditDialog> {
     final item = widget.item;
     final aiCategory = item.categorySuggestionName;
     final aiPath = item.categorySuggestionPath;
-    // Visa hela sökvägen om det finns, annars bara kategorinamnet
+    final aiLabel = (aiPath != null && aiPath.isNotEmpty)
-    final aiLabel = aiPath != null && aiPath.isNotEmpty ? aiPath : aiCategory;
+        ? aiPath
-
+        : ((aiCategory != null && aiCategory.isNotEmpty) ? aiCategory : null);
-    // Hjälpfunktion: välj produkt via tvåstegs-picker (kategori → produkt)
-    Future<void> openCategoryPicker({int? preselectedCategoryId}) async {
-      // onCreate-wrapper: lägg även till den nya produkten i _localProducts
-      Future<ProductOption?> Function(String, int)? onCreateWrapped;
-      if (widget.onCreate != null) {
-        onCreateWrapped = (name, categoryId) async {
-          final newProduct = await widget.onCreate!(name, categoryId);
-          if (newProduct != null && mounted) {
-            setState(() => _localProducts = [..._localProducts, newProduct]);
-          }
-          return newProduct;
-        };
-      }
-
-      final id = await CategoryThenProductPicker.show(
-        context,
-        categoryTree: widget.categoryTree,
-        products: _localProducts,
-        currentProductId: _productId,
-        preselectedCategoryId: preselectedCategoryId,
-        initialQuery: item.rawName,
-        onCreate: onCreateWrapped,
-      );
-      if (id != null && mounted) {
-        setState(() {
-          _productId = id;
-          _productName = _localProducts
-              .cast<ProductOption?>()
-              .firstWhere((p) => p?.id == id, orElse: () => null)
-              ?.name;
-          _productCategoryId = _categoryIdForProduct(id);
-          _productCategoryPath = _categoryPathForCategoryId(_productCategoryId);
-          _productCategorySource = CategorySelectionSource.manual;
-        });
-      }
-    }
-
-    // Hjälpfunktion: acceptera AI-förslaget
-    void acceptAiSuggestion() {
-      final sugId = item.suggestedProductId;
-      if (sugId != null) {
-        // Välj den föreslagna produkten direkt
-        setState(() {
-          _productId = sugId;
-          _productName = item.suggestedProductName;
-          _productCategoryId = _categoryIdForProduct(sugId) ?? item.categorySuggestionId;
-          _productCategoryPath =
-              _categoryPathForCategoryId(_productCategoryId) ?? item.categorySuggestionPath;
-          _productCategorySource = item.categorySuggestionPath != null
-              ? CategorySelectionSource.ai
-              : null;
-        });
-      } else {
-        // Öppna kategori → produkt med AI-föreslagen kategori förvald
-        openCategoryPicker(preselectedCategoryId: item.categorySuggestionId);
-      }
-    }
 
     return AlertDialog(
       title: Text(item.rawName, maxLines: 2, overflow: TextOverflow.ellipsis),
@@ -261,25 +240,6 @@ class _EditDialogState extends State<_EditDialog> {
           mainAxisSize: MainAxisSize.min,
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
-            // AI-kategorisuggestion — klickbar
-            if (aiLabel != null) ...[
-              Wrap(
-                children: [
-                  ActionChip(
-                    avatar: Icon(Icons.auto_awesome, size: 14, color: Colors.green.shade700),
-                    label: Text('AI: $aiLabel', style: theme.textTheme.labelSmall),
-                    backgroundColor: Colors.green.shade50,
-                    side: BorderSide(color: Colors.green.shade300),
-                    visualDensity: VisualDensity.compact,
-                    tooltip: item.suggestedProductId != null
-                        ? 'Välj "${item.suggestedProductName}" automatiskt'
-                        : 'Bläddra produkter i kategorin "$aiCategory"',
-                    onPressed: acceptAiSuggestion,
-                  ),
-                ],
-              ),
-              const SizedBox(height: 8),
-            ],
             // Destination
             SegmentedButton<_Destination>(
               segments: const [
@@ -336,6 +296,10 @@ class _EditDialogState extends State<_EditDialog> {
                                   .cast<ProductOption?>()
                                   .firstWhere((p) => p?.id == id, orElse: () => null)
                                   ?.name;
+                          _productCategoryId = _categoryIdForProduct(id);
+                          _productCategoryPath = _categoryPathForCategoryId(_productCategoryId);
+                          _productCategorySource =
+                              id == null ? null : CategorySelectionSource.manual;
                         });
                       },
                     ),
@@ -348,7 +312,7 @@ class _EditDialogState extends State<_EditDialog> {
                         minimumSize: const Size(44, 56),
                         padding: EdgeInsets.zero,
                       ),
-                      onPressed: () => openCategoryPicker(),
+                      onPressed: () => _openExistingCategoryPicker(),
                       child: const Icon(Icons.account_tree_outlined, size: 20),
                     ),
                   ),
@@ -406,9 +370,7 @@ class _EditDialogState extends State<_EditDialog> {
                     ],
                   ),
                 ),
-              ],
+                if (aiLabel != null) ...[
-              if (item.categorySuggestionPath != null &&
-                  item.categorySuggestionPath!.isNotEmpty) ...[
                   const SizedBox(height: 8),
                   Wrap(
                     children: [
@@ -419,7 +381,7 @@ class _EditDialogState extends State<_EditDialog> {
                           color: Colors.green.shade700,
                         ),
                         label: Text(
-                        'AI-förslag: ${item.categorySuggestionPath}',
+                          'AI-forslag: $aiLabel',
                           style: theme.textTheme.labelSmall,
                         ),
                         backgroundColor: Colors.green.shade50,
@@ -427,16 +389,15 @@ class _EditDialogState extends State<_EditDialog> {
                         visualDensity: VisualDensity.compact,
                         onPressed: item.categorySuggestionId == null
                             ? null
-                          : () => setState(() {
+                            : () => _openCreateCategoryPicker(
-                                _newCategoryId = item.categorySuggestionId;
+                                  preselectedCategoryId: item.categorySuggestionId,
-                                _newCategoryPath = item.categorySuggestionPath;
+                                ),
-                                _newCategorySource = CategorySelectionSource.ai;
-                              }),
                       ),
                     ],
                   ),
                 ],
               ],
+            ],
             const SizedBox(height: 12),
             if (_destination == _Destination.inventory) ...[
               Row(children: [
@@ -538,8 +499,7 @@ class _ReceiptImportTabState extends ConsumerState<ReceiptImportTab> {
           ? mineData
           : ((mineData as Map<String, dynamic>?)?['items'] as List? ?? []);
       if (mounted) {
-        setState(() {
+        final mergedProducts = [
-          _products = [
           ...globalList
               .cast<Map<String, dynamic>>()
               .map((e) => (id: e['id'] as int, name: (e['canonicalName'] ?? e['name']) as String, categoryId: (e['categoryId'] as num?)?.toInt())),
@@ -547,10 +507,24 @@ class _ReceiptImportTabState extends ConsumerState<ReceiptImportTab> {
               .cast<Map<String, dynamic>>()
               .map((e) => (id: e['id'] as int, name: (e['canonicalName'] ?? e['name']) as String, categoryId: (e['categoryId'] as num?)?.toInt())),
         ];
+        final dedupedById = <int, ProductOption>{
+          for (final product in mergedProducts) product.id: product,
+        };
+
+        setState(() {
+          _products = dedupedById.values.toList();
           _categoryTree = results[2] as List<AdminCategoryNode>;
         });
       }
-    } catch (_) {}
+    } catch (e, st) {
+      debugPrint('ReceiptImportTab._loadProducts failed: $e');
+      debugPrintStack(stackTrace: st);
+      if (mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          const SnackBar(content: Text('Kunde inte ladda produktlistan. Försök igen.')),
+        );
+      }
+    }
   }
 
   Future<void> _loadInventory() async {
@@ -621,6 +595,9 @@ class _ReceiptImportTabState extends ConsumerState<ReceiptImportTab> {
             productName: name,
             categoryId: it.categorySuggestionId,
             categoryPath: it.categorySuggestionPath,
+            categorySource: it.categorySuggestionId != null
+                ? CategorySelectionSource.ai
+                : null,
             quantity: it.quantity,
             unit: it.unit,
           ));
@@ -646,6 +623,9 @@ class _ReceiptImportTabState extends ConsumerState<ReceiptImportTab> {
           productName: item.matchedProductName ?? item.suggestedProductName,
           categoryId: item.categorySuggestionId,
           categoryPath: item.categorySuggestionPath,
+          categorySource: item.categorySuggestionId != null
+              ? CategorySelectionSource.ai
+              : null,
           quantity: item.quantity,
           unit: item.unit,
         );
@@ -866,7 +846,8 @@ class _ReceiptImportTabState extends ConsumerState<ReceiptImportTab> {
             ),
           ],
           // ── Förhandsvisning av kvitto ────────────────────────────────────────
-          if (session?.fileBytes != null) ...[            const SizedBox(height: 12),
+          if (session?.fileBytes != null) ...[
+            const SizedBox(height: 12),
             _buildReceiptPreview(theme, session!),
           ],
           const SizedBox(height: 24),