feat(shopping): listShoppingList konsolidiert g/kg + ml/l

TS-seitige Family-Gruppierung via unitFamily() + consolidate() ersetzt
die reine SQL-Aggregation. unit_key im ShoppingListRow traegt jetzt den
Family-Key ('weight', 'volume' oder raw-unit). toggleCheck-Aufrufe und
unit_key-Assertions in den Tests entsprechend angepasst.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/integration/shopping-repository.test.ts

@@ -123,7 +123,7 @@ describe('listShoppingList aggregation', () => {
     const rows = listShoppingList(db).rows;
     expect(rows).toHaveLength(1);
     expect(rows[0].name_key).toBe('mehl');
-    expect(rows[0].unit_key).toBe('g');
+    expect(rows[0].unit_key).toBe('weight');
     expect(rows[0].total_quantity).toBe(400);
     expect(rows[0].from_recipes).toContain('Carbonara');
     expect(rows[0].from_recipes).toContain('Lasagne');
@@ -201,15 +201,15 @@ describe('toggleCheck', () => {
 
   it('marks a row as checked', () => {
     const { db } = setupOneRowCart();
-    toggleCheck(db, 'mehl', 'g', true);
+    toggleCheck(db, 'mehl', 'weight', true);
     const rows = listShoppingList(db).rows;
     expect(rows[0].checked).toBe(1);
   });
 
   it('unchecks a row when passed false', () => {
     const { db } = setupOneRowCart();
-    toggleCheck(db, 'mehl', 'g', true);
-    toggleCheck(db, 'mehl', 'g', false);
+    toggleCheck(db, 'mehl', 'weight', true);
+    toggleCheck(db, 'mehl', 'weight', false);
     expect(listShoppingList(db).rows[0].checked).toBe(0);
   });
 
@@ -225,7 +225,7 @@ describe('toggleCheck', () => {
     }));
     addRecipeToCart(db, a, null);
     addRecipeToCart(db, b, null);
-    toggleCheck(db, 'mehl', 'g', true);
+    toggleCheck(db, 'mehl', 'weight', true);
     // Rezept A weg, Mehl kommt noch aus B — check bleibt, mit neuer Menge
     removeRecipeFromCart(db, a);
     const rows = listShoppingList(db).rows;
@@ -304,3 +304,116 @@ describe('clearCart', () => {
     expect(anyCheck).toBeUndefined();
   });
 });
+
+describe('listShoppingList — Konsolidierung ueber Einheiten', () => {
+  it('fasst 500 g + 1 kg Kartoffeln zu 1,5 kg zusammen', () => {
+    const db = openInMemoryForTest();
+    const a = insertRecipe(
+      db,
+      recipe({
+        title: 'Kartoffelsuppe',
+        servings_default: 4,
+        ingredients: [
+          { position: 1, name: 'Kartoffeln', quantity: 500, unit: 'g', note: null, raw_text: '', section_heading: null }
+        ]
+      })
+    );
+    const b = insertRecipe(
+      db,
+      recipe({
+        title: 'Kartoffelpuffer',
+        servings_default: 4,
+        ingredients: [
+          { position: 1, name: 'Kartoffeln', quantity: 1, unit: 'kg', note: null, raw_text: '', section_heading: null }
+        ]
+      })
+    );
+    addRecipeToCart(db, a, null);
+    addRecipeToCart(db, b, null);
+
+    const snap = listShoppingList(db);
+    const kartoffeln = snap.rows.filter((r) => r.display_name.toLowerCase() === 'kartoffeln');
+    expect(kartoffeln).toHaveLength(1);
+    expect(kartoffeln[0].total_quantity).toBe(1.5);
+    expect(kartoffeln[0].display_unit).toBe('kg');
+  });
+
+  it('kombiniert ml + l korrekt (400 ml + 0,5 l → 900 ml)', () => {
+    const db = openInMemoryForTest();
+    const a = insertRecipe(
+      db,
+      recipe({
+        title: 'R1',
+        servings_default: 4,
+        ingredients: [{ position: 1, name: 'Milch', quantity: 400, unit: 'ml', note: null, raw_text: '', section_heading: null }]
+      })
+    );
+    const b = insertRecipe(
+      db,
+      recipe({
+        title: 'R2',
+        servings_default: 4,
+        ingredients: [{ position: 1, name: 'Milch', quantity: 0.5, unit: 'l', note: null, raw_text: '', section_heading: null }]
+      })
+    );
+    addRecipeToCart(db, a, null);
+    addRecipeToCart(db, b, null);
+
+    const milch = listShoppingList(db).rows.filter((r) => r.display_name.toLowerCase() === 'milch');
+    expect(milch).toHaveLength(1);
+    expect(milch[0].total_quantity).toBe(900);
+    expect(milch[0].display_unit).toBe('ml');
+  });
+
+  it('laesst inkompatible Families getrennt (5 Stueck Eier + 500 g Eier = 2 Zeilen)', () => {
+    const db = openInMemoryForTest();
+    const a = insertRecipe(
+      db,
+      recipe({
+        title: 'R1',
+        servings_default: 4,
+        ingredients: [{ position: 1, name: 'Eier', quantity: 5, unit: 'Stück', note: null, raw_text: '', section_heading: null }]
+      })
+    );
+    const b = insertRecipe(
+      db,
+      recipe({
+        title: 'R2',
+        servings_default: 4,
+        ingredients: [{ position: 1, name: 'Eier', quantity: 500, unit: 'g', note: null, raw_text: '', section_heading: null }]
+      })
+    );
+    addRecipeToCart(db, a, null);
+    addRecipeToCart(db, b, null);
+
+    const eier = listShoppingList(db).rows.filter((r) => r.display_name.toLowerCase() === 'eier');
+    expect(eier).toHaveLength(2);
+  });
+
+  it('summiert gleiche Unit-Family ohne Konversion (2 Bund + 1 Bund → 3 Bund)', () => {
+    const db = openInMemoryForTest();
+    const a = insertRecipe(
+      db,
+      recipe({
+        title: 'R1',
+        servings_default: 4,
+        ingredients: [{ position: 1, name: 'Petersilie', quantity: 2, unit: 'Bund', note: null, raw_text: '', section_heading: null }]
+      })
+    );
+    const b = insertRecipe(
+      db,
+      recipe({
+        title: 'R2',
+        servings_default: 4,
+        ingredients: [{ position: 1, name: 'Petersilie', quantity: 1, unit: 'Bund', note: null, raw_text: '', section_heading: null }]
+      })
+    );
+    addRecipeToCart(db, a, null);
+    addRecipeToCart(db, b, null);
+
+    const petersilie = listShoppingList(db).rows.filter((r) => r.display_name.toLowerCase() === 'petersilie');
+    expect(petersilie).toHaveLength(1);
+    expect(petersilie[0].total_quantity).toBe(3);
+    expect(petersilie[0].display_unit?.toLowerCase()).toBe('bund');
+  });
+});