Add permanent list delete; move stores out of main nav

- Add DELETE /api/lists/{id}/permanent endpoint for hard-delete alongside existing soft-delete (archive)
- Add Delete button with confirmation on list detail page next to Archive
- Handle ListDeleted SignalR event on lists overview for real-time removal
- Remove Stores from bottom nav; add Manage stores link at bottom of Lists page
- Add back-to-lists navigation on the Stores page

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

src/backend/YesChef.Api/Features/ShoppingLists/ShoppingListEndpoints.cs

@@ -185,6 +185,20 @@ public static class ShoppingListEndpoints
             return Results.NoContent();
         });
 
+        group.MapDelete("/{id:int}/permanent", async (int id, YesChefDb db, HttpContext http, IHubContext<ShoppingListHub> hub) =>
+        {
+            var familyId = http.User.GetFamilyId();
+            var list = await db.ShoppingLists.FirstOrDefaultAsync(l => l.Id == id && l.FamilyId == familyId);
+            if (list is null) return Results.NotFound();
+
+            db.ShoppingLists.Remove(list);
+            await db.SaveChangesAsync();
+
+            await hub.Clients.Group(OverviewGroup(familyId)).SendAsync("ListDeleted", new { list.Id });
+
+            return Results.NoContent();
+        });
+
         group.MapPost("/{listId:int}/items", async (int listId, AddItemRequest request, YesChefDb db, HttpContext http, IHubContext<ShoppingListHub> hub) =>
         {
             var familyId = http.User.GetFamilyId();

src/frontend/src/routes/+layout.svelte

@@ -17,7 +17,6 @@
 	const navItems = [
 		{ href: '/lists', label: 'Lists', icon: '📋' },
 		{ href: '/recipes', label: 'Recipes', icon: '📖' },
-		{ href: '/stores', label: 'Stores', icon: '🏪' },
 		{ href: '/family', label: 'Family', icon: '👪' }
 	];
 

src/frontend/src/routes/lists/+page.svelte

@@ -46,6 +46,10 @@
 			lists = lists.filter((l) => l.id !== data.id);
 		});
 
+		connection.on('ListDeleted', (data: { id: number }) => {
+			lists = lists.filter((l) => l.id !== data.id);
+		});
+
 		connection.on('ListSummaryUpdated', (data: ListSummary) => {
 			lists = lists.map((l) =>
 				l.id === data.id ? { ...l, itemCount: data.itemCount, checkedCount: data.checkedCount, updatedAt: data.updatedAt } : l
@@ -148,4 +152,11 @@
 			{/each}
 		</div>
 	{/if}
+
+	<div class="mt-6 border-t border-gray-100 pt-4">
+		<a href="/stores" class="flex items-center justify-between text-sm text-gray-500">
+			<span>Manage stores</span>
+			<span>&rsaquo;</span>
+		</a>
+	</div>
 </div>

src/frontend/src/routes/lists/[id]/+page.svelte

@@ -253,6 +253,12 @@
 		await api(`/api/lists/${listId}`, { method: 'DELETE' });
 		goto('/lists');
 	}
+
+	async function deleteList() {
+		if (!confirm(`Permanently delete "${list!.name}"? This cannot be undone.`)) return;
+		await api(`/api/lists/${listId}/permanent`, { method: 'DELETE' });
+		goto('/lists');
+	}
 </script>
 
 {#if loading}
@@ -265,12 +271,20 @@
 				<h2 class="text-2xl font-bold">{list.name}</h2>
 				<p class="text-sm text-gray-500">{list.store.name}</p>
 			</div>
-			<button
-				onclick={archiveList}
-				class="rounded-lg border border-gray-300 px-3 py-1.5 text-sm text-gray-500"
-			>
-				Archive
-			</button>
+			<div class="flex gap-2">
+				<button
+					onclick={archiveList}
+					class="rounded-lg border border-gray-300 px-3 py-1.5 text-sm text-gray-500"
+				>
+					Archive
+				</button>
+				<button
+					onclick={deleteList}
+					class="btn-danger-link text-sm"
+				>
+					Delete
+				</button>
+			</div>
 		</div>
 
 		<form onsubmit={e => { e.preventDefault(); addItem(); }} class="mb-4 space-y-2">

src/frontend/src/routes/stores/+page.svelte

@@ -152,7 +152,10 @@
 </script>
 
 <div>
-	<h2 class="mb-4 text-2xl font-bold">Stores</h2>
+	<div class="mb-4">
+		<a href="/lists" class="text-sm text-gray-500">&larr; Back to lists</a>
+		<h2 class="mt-1 text-2xl font-bold">Stores</h2>
+	</div>
 
 	<form onsubmit={e => { e.preventDefault(); addStore(); }} class="mb-6 flex gap-2">
 		<input