feat: separate categories table + /categories management page

- Categories table (id, name unique) with FK from groceries.category_id
- /categories page for add/delete categories
- Main page uses native <select> dropdown for category
- Categories grouped by name in list/catalog views
- Regenerated drizzle migrations from scratch

2 files changed, 21 insertions, 5 deletions

diff --git a/src/lib/server/db/groceries.test.ts b/src/lib/server/db/groceries.test.ts
index b4f5050..bd14040 100644
--- a/src/lib/server/db/groceries.test.ts
+++ b/src/lib/server/db/groceries.test.ts
@@ -1,24 +1,30 @@
 import { describe, it, expect, beforeEach } from 'vitest';
 import { drizzle } from 'drizzle-orm/libsql';
 import { createClient } from '@libsql/client';
-import { groceries } from '$lib/server/db/schema';
+import { groceries, categories } from '$lib/server/db/schema';
 import { eq } from 'drizzle-orm';
 
 describe('groceries add', () => {
 	const client = createClient({ url: ':memory:' });
-	const db = drizzle(client, { schema: { groceries } });
+	const db = drizzle(client, { schema: { groceries, categories } });
 
 	beforeEach(async () => {
 		await db.run(`DROP TABLE IF EXISTS groceries`);
+		await db.run(`DROP TABLE IF EXISTS categories`);
+		await db.run(`CREATE TABLE categories (
+			id INTEGER PRIMARY KEY AUTOINCREMENT,
+			name TEXT NOT NULL
+		)`);
 		await db.run(`CREATE TABLE groceries (
 			id INTEGER PRIMARY KEY AUTOINCREMENT,
 			name TEXT NOT NULL,
 			checked INTEGER NOT NULL DEFAULT 0,
-			created_at TEXT NOT NULL
+			created_at TEXT NOT NULL,
+			category_id INTEGER REFERENCES categories(id)
 		)`);
 	});
 
-	async function addItem(name: string) {
+	async function addItem(name: string, categoryId?: number | null) {
 		const existing = await db
 			.select()
 			.from(groceries)
@@ -28,11 +34,15 @@ describe('groceries add', () => {
 		if (existing.length > 0) {
 			await db
 				.update(groceries)
-				.set({ checked: false })
+				.set({
+					checked: false,
+					categoryId: categoryId ?? existing[0].categoryId,
+				})
 				.where(eq(groceries.id, existing[0].id));
 		} else {
 			await db.insert(groceries).values({
 				name,
+				categoryId,
 				createdAt: new Date().toISOString(),
 			});
 		}
diff --git a/src/lib/server/db/schema.ts b/src/lib/server/db/schema.ts
index 403ef51..1d5fd9e 100644
--- a/src/lib/server/db/schema.ts
+++ b/src/lib/server/db/schema.ts
@@ -1,8 +1,14 @@
 import { sqliteTable, text, integer } from 'drizzle-orm/sqlite-core';
 
+export const categories = sqliteTable('categories', {
+	id: integer('id').primaryKey({ autoIncrement: true }),
+	name: text('name').notNull().unique(),
+});
+
 export const groceries = sqliteTable('groceries', {
 	id: integer('id').primaryKey({ autoIncrement: true }),
 	name: text('name').notNull().unique(),
 	checked: integer('checked', { mode: 'boolean' }).notNull().default(false),
 	createdAt: text('created_at').notNull(),
+	categoryId: integer('category_id').references(() => categories.id),
 });