feat: add package quantity normalization and AI suggestion handling in receipt import

flutter/lib/core/utils/pdf_opener_web.dart

@@ -1,3 +1,4 @@
+import 'dart:async';
 import 'dart:js_interop';
 import 'dart:typed_data';
 
@@ -14,6 +15,9 @@ Future<bool> openPdfBytes(Uint8List bytes) async {
     web.URL.revokeObjectURL(url);
     return false;
   }
-  web.URL.revokeObjectURL(url);
+  // Revoke later to avoid revoking before the new tab has loaded the blob.
+  Future<void>.delayed(const Duration(seconds: 30), () {
+    web.URL.revokeObjectURL(url);
+  });
   return true;
 }

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

@@ -22,6 +22,70 @@ typedef _Destination = ImportDestination;
 
 enum _ProductEntryMode { existing, create }
 
+({double quantity, String unit})? _normalizePackageQuantityFromRawName({
+  required String rawName,
+  required double? quantity,
+  required String? unit,
+}) {
+  if (quantity == null || unit == null) return null;
+
+  final normalizedUnit = unit.trim().toLowerCase();
+  const packageUnits = {
+    'paket',
+    'forpackning',
+    'forp',
+    'forp.',
+    'förpackning',
+    'förp',
+    'förp.',
+    'fp',
+    'pkt',
+    'pack',
+    'st',
+    'styck',
+  };
+  if (!packageUnits.contains(normalizedUnit)) return null;
+
+  final match = RegExp(
+    r'(\d+(?:[\.,]\d+)?)\s*(ml|cl|dl|l|g|kg)\b',
+    caseSensitive: false,
+  ).firstMatch(rawName);
+  if (match == null) return null;
+
+  final value = double.tryParse(match.group(1)!.replaceAll(',', '.'));
+  final sizeUnit = match.group(2)!.toLowerCase();
+  if (value == null) return null;
+
+  switch (sizeUnit) {
+    case 'ml':
+      return (quantity: quantity * (value / 1000.0), unit: 'l');
+    case 'cl':
+      return (quantity: quantity * (value / 100.0), unit: 'l');
+    case 'dl':
+      return (quantity: quantity * (value / 10.0), unit: 'l');
+    case 'l':
+      return (quantity: quantity * value, unit: 'l');
+    case 'g':
+      return (quantity: quantity * (value / 1000.0), unit: 'kg');
+    case 'kg':
+      return (quantity: quantity * value, unit: 'kg');
+    default:
+      return null;
+  }
+}
+
+String _formatCompactNumber(double value) {
+  if (value == value.roundToDouble()) return value.toStringAsFixed(0);
+  final formatted = value.toStringAsFixed(3);
+  return formatted
+      .replaceFirst(RegExp(r'0+$'), '')
+      .replaceFirst(RegExp(r'\.$'), '');
+}
+
+String _formatSwedishNumber(double value) {
+  return _formatCompactNumber(value).replaceAll('.', ',');
+}
+
 // ── Redigeringstillstånd per rad ─────────────────────────────────────────────
 
 typedef _ItemEdit = ItemEdit;
@@ -175,6 +239,25 @@ class _EditDialogState extends State<_EditDialog> {
     }
   }
 
+  void _applyAiSuggestionForExistingSelection() {
+    final suggestedId = widget.item.suggestedProductId;
+    if (suggestedId != null) {
+      setState(() {
+        _productId = suggestedId;
+        _productName = widget.item.suggestedProductName;
+        _productCategoryId = _categoryIdForProduct(suggestedId) ?? widget.item.categorySuggestionId;
+        _productCategoryPath =
+            _categoryPathForCategoryId(_productCategoryId) ?? widget.item.categorySuggestionPath;
+        _productCategorySource = CategorySelectionSource.ai;
+      });
+      return;
+    }
+
+    _openExistingCategoryPicker(
+      preselectedCategoryId: widget.item.categorySuggestionId,
+    );
+  }
+
   bool get _canConfirm {
     if (_entryMode == _ProductEntryMode.create) {
       return !_isCreatingProduct &&
@@ -232,6 +315,16 @@ class _EditDialogState extends State<_EditDialog> {
     final aiLabel = (aiPath != null && aiPath.isNotEmpty)
         ? aiPath
         : ((aiCategory != null && aiCategory.isNotEmpty) ? aiCategory : null);
+    final currentQuantity =
+        double.tryParse(_quantityCtrl.text.replaceAll(',', '.')) ?? widget.item.quantity;
+    final currentUnit = _unitCtrl.text.trim().isEmpty ? widget.item.unit : _unitCtrl.text.trim();
+    final normalizationPreview = _destination == _Destination.inventory
+        ? _normalizePackageQuantityFromRawName(
+            rawName: item.rawName,
+            quantity: currentQuantity,
+            unit: currentUnit,
+          )
+        : null;
 
     return AlertDialog(
       title: Text(item.rawName, maxLines: 2, overflow: TextOverflow.ellipsis),
@@ -279,43 +372,66 @@ class _EditDialogState extends State<_EditDialog> {
             ),
             const SizedBox(height: 12),
             if (_entryMode == _ProductEntryMode.existing)
-              Row(
+              Column(
+                crossAxisAlignment: CrossAxisAlignment.start,
                 children: [
-                  Expanded(
+                  Row(
-                    child: ProductPickerField(
+                    children: [
-                      products: _localProducts,
+                      Expanded(
-                      value: _productId,
+                        child: ProductPickerField(
-                      label: 'Produkt',
+                          products: _localProducts,
-                      initialQuery: item.rawName,
+                          value: _productId,
-                      onChanged: (id) {
+                          label: 'Produkt',
-                        setState(() {
+                          initialQuery: item.rawName,
-                          _productId = id;
+                          onChanged: (id) {
-                          _productName = id == null
+                            setState(() {
-                              ? null
+                              _productId = id;
-                              : _localProducts
+                              _productName = id == null
-                                  .cast<ProductOption?>()
+                                  ? null
-                                  .firstWhere((p) => p?.id == id, orElse: () => null)
+                                  : _localProducts
-                                  ?.name;
+                                      .cast<ProductOption?>()
-                          _productCategoryId = _categoryIdForProduct(id);
+                                      .firstWhere((p) => p?.id == id, orElse: () => null)
-                          _productCategoryPath = _categoryPathForCategoryId(_productCategoryId);
+                                      ?.name;
-                          _productCategorySource =
+                              _productCategoryId = _categoryIdForProduct(id);
-                              id == null ? null : CategorySelectionSource.manual;
+                              _productCategoryPath = _categoryPathForCategoryId(_productCategoryId);
-                        });
+                              _productCategorySource =
-                      },
+                                  id == null ? null : CategorySelectionSource.manual;
-                    ),
+                            });
-                  ),
+                          },
-                  const SizedBox(width: 8),
+                        ),
-                  Tooltip(
-                    message: 'Välj via kategori',
-                    child: OutlinedButton(
-                      style: OutlinedButton.styleFrom(
-                        minimumSize: const Size(44, 56),
-                        padding: EdgeInsets.zero,
                       ),
-                      onPressed: () => _openExistingCategoryPicker(),
+                      const SizedBox(width: 8),
-                      child: const Icon(Icons.account_tree_outlined, size: 20),
+                      Tooltip(
-                    ),
+                        message: 'Välj via kategori',
+                        child: OutlinedButton(
+                          style: OutlinedButton.styleFrom(
+                            minimumSize: const Size(44, 56),
+                            padding: EdgeInsets.zero,
+                          ),
+                          onPressed: () => _openExistingCategoryPicker(),
+                          child: const Icon(Icons.account_tree_outlined, size: 20),
+                        ),
+                      ),
+                    ],
                   ),
+                  if (aiLabel != null) ...[
+                    const SizedBox(height: 8),
+                    ActionChip(
+                      avatar: Icon(
+                        Icons.auto_awesome,
+                        size: 14,
+                        color: Colors.green.shade700,
+                      ),
+                      label: Text(
+                        'AI-forslag: $aiLabel',
+                        style: theme.textTheme.labelSmall,
+                      ),
+                      backgroundColor: Colors.green.shade50,
+                      side: BorderSide(color: Colors.green.shade300),
+                      visualDensity: VisualDensity.compact,
+                      onPressed: _applyAiSuggestionForExistingSelection,
+                    ),
+                  ],
                 ],
               )
             else ...[
@@ -406,6 +522,7 @@ class _EditDialogState extends State<_EditDialog> {
                     controller: _quantityCtrl,
                     keyboardType: const TextInputType.numberWithOptions(decimal: true),
                     decoration: const InputDecoration(labelText: 'Antal', border: OutlineInputBorder()),
+                    onChanged: (_) => setState(() {}),
                   ),
                 ),
                 const SizedBox(width: 8),
@@ -413,9 +530,29 @@ class _EditDialogState extends State<_EditDialog> {
                   child: TextField(
                     controller: _unitCtrl,
                     decoration: const InputDecoration(labelText: 'Enhet', border: OutlineInputBorder()),
+                    onChanged: (_) => setState(() {}),
                   ),
                 ),
               ]),
+              if (normalizationPreview != null) ...[
+                const SizedBox(height: 8),
+                Container(
+                  width: double.infinity,
+                  padding: const EdgeInsets.all(10),
+                  decoration: BoxDecoration(
+                    color: Colors.green.shade50,
+                    borderRadius: BorderRadius.circular(10),
+                    border: Border.all(color: Colors.green.shade200),
+                  ),
+                  child: Text(
+                    'Tolkat som totalt ${_formatSwedishNumber(normalizationPreview.quantity)} ${normalizationPreview.unit} '
+                    '(antal x förpackningsstorlek).',
+                    style: theme.textTheme.bodySmall?.copyWith(
+                      color: Colors.green.shade800,
+                    ),
+                  ),
+                ),
+              ],
             ] else ...[
               Text(
                 'Baslager sparar bara produkt — ingen mängd eller enhet.',
@@ -708,8 +845,13 @@ class _ReceiptImportTabState extends ConsumerState<ReceiptImportTab> {
             pantryAdded++;
           }
         } else {
-          final qty = edit.quantity ?? item.quantity ?? 1.0;
+          final normalized = _normalizePackageQuantityFromRawName(
-          final unit = edit.unit ?? item.unit ?? 'st';
+            rawName: item.rawName,
+            quantity: edit.quantity ?? item.quantity,
+            unit: edit.unit ?? item.unit,
+          );
+          final qty = normalized?.quantity ?? edit.quantity ?? item.quantity ?? 1.0;
+          final unit = normalized?.unit ?? edit.unit ?? item.unit ?? 'st';
           final existing = _inventoryByProduct[pid];
           if (existing != null) {
             await invRepo.updateInventoryItem(