feat(editor): Sektionen-Handler + save-Patch mit section_heading

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

src/lib/components/RecipeEditor.svelte

@@ -43,7 +43,8 @@
         qty: i.quantity !== null ? String(i.quantity).replace('.', ',') : '',
         unit: i.unit ?? '',
         name: i.name,
-        note: i.note ?? ''
+        note: i.note ?? '',
+        section_heading: i.section_heading
       }))
     )
   );
@@ -52,7 +53,7 @@
   );
 
   function addIngredient() {
-    ingredients = [...ingredients, { qty: '', unit: '', name: '', note: '' }];
+    ingredients = [...ingredients, { qty: '', unit: '', name: '', note: '', section_heading: null }];
   }
   function removeIngredient(idx: number) {
     ingredients = ingredients.filter((_, i) => i !== idx);
@@ -64,6 +65,16 @@
     [next[idx], next[target]] = [next[target], next[idx]];
     ingredients = next;
   }
+  function addSection(idx: number) {
+    const next = [...ingredients];
+    next[idx] = { ...next[idx], section_heading: '' };
+    ingredients = next;
+  }
+  function removeSection(idx: number) {
+    const next = [...ingredients];
+    next[idx] = { ...next[idx], section_heading: null };
+    ingredients = next;
+  }
   function addStep() {
     steps = [...steps, { text: '' }];
   }
@@ -94,13 +105,15 @@
         if (qty !== null) rawParts.push(String(qty).replace('.', ','));
         if (unit) rawParts.push(unit);
         rawParts.push(name);
+        const heading = i.section_heading === null ? null : (i.section_heading.trim() || null);
         return {
           position: idx + 1,
           quantity: qty,
           unit,
           name,
           note,
-          raw_text: rawParts.join(' ')
+          raw_text: rawParts.join(' '),
+          section_heading: heading
         };
       });
     const cleanedSteps: Step[] = steps
@@ -174,6 +187,8 @@
           total={ingredients.length}
           onmove={(dir) => moveIngredient(idx, dir)}
           onremove={() => removeIngredient(idx)}
+          onaddSection={() => addSection(idx)}
+          onremoveSection={() => removeSection(idx)}
         />
       {/each}
     </ul>