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, 32 insertions, 0 deletions

diff --git a/src/lib/server/db/ondelete.test.ts b/src/lib/server/db/ondelete.test.ts
new file mode 100644
index 0000000..c2c86de
--- /dev/null
+++ b/src/lib/server/db/ondelete.test.ts
@@ -0,0 +1,32 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import { groceries, categories } from '$lib/server/db/schema';
+import { eq } from 'drizzle-orm';
+import { createTestDb } from './test-helper';
+
+describe('category delete behavior', () => {
+	let db: Awaited<ReturnType<typeof createTestDb>>['db'];
+
+	beforeEach(async () => {
+		const testDb = await createTestDb();
+		db = testDb.db;
+	});
+
+	it('sets category_id to null when a referenced category is deleted', async () => {
+		await db.insert(categories).values({ name: 'Boissons' });
+		const cats = await db.select().from(categories);
+		const catId = cats[0].id;
+
+		await db.insert(groceries).values({
+			name: 'lait',
+			checked: false,
+			createdAt: new Date().toISOString(),
+			categoryId: catId,
+		});
+
+		await db.delete(categories).where(eq(categories.id, catId));
+
+		const items = await db.select().from(groceries);
+		expect(items).toHaveLength(1);
+		expect(items[0].categoryId).toBeNull();
+	});
+});