refactor: services layer, valibot validation, shared CSS utilities, aria labels, and drizzle migrate

- Extract groceries/categories/references services with db injection
- Add valibot for form validation and safe numeric id parsing
- Fix category delete FK behavior with onDelete: set null + migration
- Replace custom migrate.js with drizzle-orm/libsql/migrator
- Add shared CSS utility classes in app.css (forms, lists, buttons)
- Add aria-pressed and aria-label on interactive elements
- Remove redundant app.css imports and unused /stores import
- Add integration tests for all services using drizzle migrate helper
- Remove smoke test; add db:migrate and db:studio scripts

1 files changed, 70 insertions, 0 deletions

diff --git a/src/lib/server/services/references.test.ts b/src/lib/server/services/references.test.ts
new file mode 100644
index 0000000..c02f9e6
--- /dev/null
+++ b/src/lib/server/services/references.test.ts
@@ -0,0 +1,70 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import { groceries, references } from '$lib/server/db/schema';
+import { eq } from 'drizzle-orm';
+import { createTestDb } from '$lib/server/db/test-helper';
+import { loadForGrocery, add, deleteReference } from './references';
+
+describe('references service', () => {
+	let db: Awaited<ReturnType<typeof createTestDb>>['db'];
+
+	beforeEach(async () => {
+		const testDb = await createTestDb();
+		db = testDb.db;
+	});
+
+	it('loadForGrocery returns refs for the given grocery', async () => {
+		const now = new Date().toISOString();
+		const [g1] = await db
+			.insert(groceries)
+			.values({ name: 'coffee', checked: false, createdAt: now })
+			.returning();
+		const [g2] = await db
+			.insert(groceries)
+			.values({ name: 'tea', checked: false, createdAt: now })
+			.returning();
+
+		await db.insert(references).values([
+			{ groceryId: g1.id, reference: 'Brand A' },
+			{ groceryId: g2.id, reference: 'Brand B' },
+		]);
+
+		const refs = await loadForGrocery(g1.id, db);
+		expect(refs).toHaveLength(1);
+		expect(refs[0].reference).toBe('Brand A');
+	});
+
+	it('add creates a reference', async () => {
+		const now = new Date().toISOString();
+		const [g] = await db
+			.insert(groceries)
+			.values({ name: 'pasta', checked: false, createdAt: now })
+			.returning();
+
+		const ref = await add(g.id, 'Barilla', 2.5, '€/kg', 85, db);
+		expect(ref.reference).toBe('Barilla');
+		expect(ref.price).toBe(2.5);
+
+		const rows = await db
+			.select()
+			.from(references)
+			.where(eq(references.groceryId, g.id));
+		expect(rows).toHaveLength(1);
+	});
+
+	it('deleteReference removes the ref', async () => {
+		const now = new Date().toISOString();
+		const [g] = await db
+			.insert(groceries)
+			.values({ name: 'rice', checked: false, createdAt: now })
+			.returning();
+		const [ref] = await db
+			.insert(references)
+			.values({ groceryId: g.id, reference: 'Brand X' })
+			.returning();
+
+		await deleteReference(ref.id, db);
+
+		const rows = await db.select().from(references);
+		expect(rows).toHaveLength(0);
+	});
+});