feat(wishlist): per-user Wünsche + Header-Badge mit Gesamtzahl

Schema-Änderung (Migration 005):
- Tabelle wishlist umgestellt auf PK (recipe_id, profile_id)
- wishlist_like-Tabelle zusammengelegt — Liken WAR schon "will ich auch",
  also werden alle bestehenden Likes Memberships auf der neuen Tabelle.
- Alt-Einträge mit added_by_profile_id werden migriert, anonyme gehen
  verloren (war inkonsistent, jetzt erzwingen wir profile_id NOT NULL).

Repository:
- listWishlist aggregiert pro Rezept: wanted_by_count, wanted_by_names
  (kommagetrennt), on_my_wishlist für das aktive Profil
- listWishlistProfileIds(recipeId) für den Recipe-Page-Loader
- countWishlistRecipes für das Header-Badge (DISTINCT recipe_id)
- addToWishlist/removeFromWishlist/isOnMyWishlist alle mit profile_id
  als Pflicht

API:
- POST /api/wishlist: profile_id jetzt Pflicht (nullable raus)
- DELETE /api/wishlist/[recipe_id]?profile_id=X (nur eigenes Entry)
- /api/wishlist/[recipe_id]/like komplett entfernt (Konzept obsolet)
- Neu: GET /api/wishlist/count → { count: <distinct recipes> }

UI:
- Header-Heart bekommt rotes Badge mit Zahl der Wunschliste-Rezepte.
  wishlistStore in $lib/client/wishlist.svelte.ts hält den Count reaktiv;
  Refresh auf Mount, nach Add/Remove, beim Öffnen der Wunschliste.
- Recipe-Detail: Loader liefert wishlist_profile_ids; onMyWishlist ist
  ein $derived. Toggle fragt aktives Profil (alertAction sonst), mutiert
  die lokale Liste + ruft wishlistStore.refresh.
- Wunschliste-Seite: Heart toggelt eigenen Wunsch, Count zeigt Gesamt-
  wünsche, kommagetrennte Namen zeigen "wer will". Trash-Button
  entfernt — Heart-off reicht jetzt.

Tests (99 → 99, 8 neu geschrieben):
- Per-User-Add/Remove, aggregierte Counts, on_my_wishlist, Cascades bei
  Recipe/Profile-Delete, countWishlistRecipes = DISTINCT.

src/routes/recipes/[id]/+page.server.ts

@@ -8,6 +8,7 @@ import {
   listFavoriteProfiles,
   listRatings
 } from '$lib/server/recipes/actions';
+import { listWishlistProfileIds } from '$lib/server/wishlist/repository';
 
 export const load: PageServerLoad = async ({ params }) => {
   const id = Number(params.id);
@@ -19,7 +20,16 @@ export const load: PageServerLoad = async ({ params }) => {
   const comments = listComments(db, id);
   const cooking_log = listCookingLog(db, id);
   const favorite_profile_ids = listFavoriteProfiles(db, id);
+  const wishlist_profile_ids = listWishlistProfileIds(db, id);
   const avg_stars =
     ratings.length === 0 ? null : ratings.reduce((s, r) => s + r.stars, 0) / ratings.length;
-  return { recipe, ratings, comments, cooking_log, favorite_profile_ids, avg_stars };
+  return {
+    recipe,
+    ratings,
+    comments,
+    cooking_log,
+    favorite_profile_ids,
+    wishlist_profile_ids,
+    avg_stars
+  };
 };

src/routes/recipes/[id]/+page.svelte

@@ -14,6 +14,7 @@
   import RecipeView from '$lib/components/RecipeView.svelte';
   import StarRating from '$lib/components/StarRating.svelte';
   import { profileStore } from '$lib/client/profile.svelte';
+  import { wishlistStore } from '$lib/client/wishlist.svelte';
   import { confirmAction, alertAction } from '$lib/client/confirm.svelte';
   import type { CommentRow } from '$lib/server/recipes/actions';
 
@@ -24,7 +25,7 @@
   let comments = $state<CommentRow[]>([]);
   let cookingLog = $state<typeof data.cooking_log>([]);
   let favoriteProfileIds = $state<number[]>([]);
-  let onWishlist = $state(false);
+  let wishlistProfileIds = $state<number[]>([]);
   let newComment = $state('');
 
   let title = $state('');
@@ -37,6 +38,7 @@
     comments = [...data.comments];
     cookingLog = [...data.cooking_log];
     favoriteProfileIds = [...data.favorite_profile_ids];
+    wishlistProfileIds = [...data.wishlist_profile_ids];
     title = data.recipe.title;
   });
 
@@ -50,6 +52,10 @@
     profileStore.active ? favoriteProfileIds.includes(profileStore.active.id) : false
   );
 
+  const onMyWishlist = $derived(
+    profileStore.active ? wishlistProfileIds.includes(profileStore.active.id) : false
+  );
+
   async function setRating(stars: number) {
     if (!profileStore.active) {
       await alertAction({
@@ -195,27 +201,28 @@
   }
 
   async function toggleWishlist() {
-    if (onWishlist) {
-      await fetch(`/api/wishlist/${data.recipe.id}`, { method: 'DELETE' });
-      onWishlist = false;
+    if (!profileStore.active) {
+      await alertAction({
+        title: 'Kein Profil gewählt',
+        message: 'Tippe oben rechts auf „Profil wählen", dann klappt die Aktion.'
+      });
+      return;
+    }
+    const profileId = profileStore.active.id;
+    if (onMyWishlist) {
+      await fetch(`/api/wishlist/${data.recipe.id}?profile_id=${profileId}`, {
+        method: 'DELETE'
+      });
+      wishlistProfileIds = wishlistProfileIds.filter((id) => id !== profileId);
     } else {
       await fetch('/api/wishlist', {
         method: 'POST',
         headers: { 'content-type': 'application/json' },
-        body: JSON.stringify({
-          recipe_id: data.recipe.id,
-          profile_id: profileStore.active?.id ?? null
-        })
+        body: JSON.stringify({ recipe_id: data.recipe.id, profile_id: profileId })
       });
-      onWishlist = true;
+      wishlistProfileIds = [...wishlistProfileIds, profileId];
     }
-  }
-
-  async function refreshWishlistState() {
-    const res = await fetch('/api/wishlist?sort=newest');
-    if (!res.ok) return;
-    const body = await res.json();
-    onWishlist = body.entries.some((e: { recipe_id: number }) => e.recipe_id === data.recipe.id);
+    void wishlistStore.refresh();
   }
 
   // Wake-Lock
@@ -232,7 +239,6 @@
 
   onMount(() => {
     void requestWakeLock();
-    void refreshWishlistState();
     const onVisibility = () => {
       if (document.visibilityState === 'visible' && !wakeLock) void requestWakeLock();
     };
@@ -286,8 +292,8 @@
           <Heart size={18} strokeWidth={2} fill={isFav ? 'currentColor' : 'none'} />
           <span>Favorit</span>
         </button>
-        <button class="btn" class:wish={onWishlist} onclick={toggleWishlist}>
-          {#if onWishlist}
+        <button class="btn" class:wish={onMyWishlist} onclick={toggleWishlist}>
+          {#if onMyWishlist}
             <Check size={18} strokeWidth={2.5} />
             <span>Auf Wunschliste</span>
           {:else}