Add tabs for all, own and favourite recipes

- Tabs "Alle", "Eigene Rezepte", "Favoriten" above the recipe list;
  search and tag filters stay within the active tab
- Menu link to own recipes; empty states per tab
- Fix recipe card images rendering portrait instead of 4:3

Co-Authored-By: Claude Opus 5.5 <[email protected]>

tests/test_recipes.py

@@ -204,3 +204,28 @@ def test_imported_draft_defaults_to_public(user_client, settings):
 def test_private_can_still_be_chosen(user_client):
     user_client.post(reverse("recipes:create"), form_data(visibility="private"))
     assert Recipe.objects.get().visibility == "private"
+
+
+def test_tabs_and_own_recipes_tab(user_client, user, other_user):
+    make_recipe(user, title="Meins", visibility=Recipe.Visibility.PRIVATE)
+    make_recipe(other_user, title="Deins")
+    response = user_client.get(reverse("recipes:list"), {"ansicht": "meine"})
+    html = response.content.decode()
+    assert "Eigene Rezepte" in html and 'aria-current="page">Eigene Rezepte' in html
+    assert [r.title for r in response.context["page"].object_list] == ["Meins"]
+    all_titles = {r.title for r in user_client.get(reverse("recipes:list")).context["page"].object_list}
+    assert all_titles == {"Meins", "Deins"}
+
+
+def test_search_stays_in_own_tab(user_client, user, other_user):
+    make_recipe(user, title="Linsensuppe")
+    make_recipe(other_user, title="Linsensalat")
+    response = user_client.get(reverse("recipes:list"), {"ansicht": "meine", "q": "linsen"})
+    assert [r.title for r in response.context["page"].object_list] == ["Linsensuppe"]
+    assert '<input type="hidden" name="ansicht" value="meine">' in response.content.decode()
+
+
+def test_own_tab_empty_state(user_client, other_user):
+    make_recipe(other_user, title="Deins")
+    html = user_client.get(reverse("recipes:list"), {"ansicht": "meine"}).content.decode()
+    assert "noch keine eigenen Rezepte" in html and "Deins" not in html