feat: catalog section + deduplicate items by name

- Show all items split into List (unchecked) and Catalog (checked) sections
- Tapping a catalog item unchecks it (returns to list)
- Add action now upserts: unchecks existing item instead of creating duplicate
- UNIQUE constraint on groceries.name as defense-in-depth
- Tests for dedup behavior (insert, re-add from catalog, no-op on list)

1 files changed, 17 insertions, 5 deletions

diff --git a/src/routes/+page.server.ts b/src/routes/+page.server.ts
index e6f3b0f..947cc3b 100644
--- a/src/routes/+page.server.ts
+++ b/src/routes/+page.server.ts
@@ -8,7 +8,6 @@ export const load: PageServerLoad = async () => {
 	const items = await db
 		.select()
 		.from(groceries)
-		.where(eq(groceries.checked, false))
 		.orderBy(desc(groceries.createdAt));
 
 	return { items };
@@ -23,10 +22,23 @@ export const actions: Actions = {
 			return fail(400, { error: 'Name is required' });
 		}
 
-		await db.insert(groceries).values({
-			name,
-			createdAt: new Date().toISOString(),
-		});
+		const [existing] = await db
+			.select()
+			.from(groceries)
+			.where(eq(groceries.name, name))
+			.limit(1);
+
+		if (existing) {
+			await db
+				.update(groceries)
+				.set({ checked: false })
+				.where(eq(groceries.id, existing.id));
+		} else {
+			await db.insert(groceries).values({
+				name,
+				createdAt: new Date().toISOString(),
+			});
+		}
 
 		return { success: true };
 	},