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, 172 insertions, 0 deletions

diff --git a/src/routes/categories/+page.server.ts b/src/routes/categories/+page.server.ts
new file mode 100644
index 0000000..241370e
--- /dev/null
+++ b/src/routes/categories/+page.server.ts
@@ -0,0 +1,38 @@
+import { fail } from '@sveltejs/kit';
+import { db } from '$lib/server/db';
+import { categories } from '$lib/server/db/schema';
+import { eq, asc } from 'drizzle-orm';
+import type { Actions, PageServerLoad } from './$types';
+
+export const load: PageServerLoad = async () => {
+	const items = await db
+		.select()
+		.from(categories)
+		.orderBy(asc(categories.name));
+
+	return { categories: items };
+};
+
+export const actions: Actions = {
+	add: async ({ request }) => {
+		const data = await request.formData();
+		const name = data.get('name')?.toString().trim();
+
+		if (!name) {
+			return fail(400, { error: 'Name is required' });
+		}
+
+		await db.insert(categories).values({ name });
+
+		return { success: true };
+	},
+
+	delete: async ({ request }) => {
+		const data = await request.formData();
+		const id = Number(data.get('id'));
+
+		await db.delete(categories).where(eq(categories.id, id));
+
+		return { success: true };
+	},
+};
diff --git a/src/routes/categories/+page.svelte b/src/routes/categories/+page.svelte
new file mode 100644
index 0000000..0dfc96c
--- /dev/null
+++ b/src/routes/categories/+page.svelte
@@ -0,0 +1,134 @@
+<script lang="ts">
+	import '../../app.css';
+	import { enhance } from '$app/forms';
+
+	let { data, form } = $props();
+	let name = $state('');
+</script>
+
+<h1>Categories</h1>
+
+<form class="add-form" method="POST" action="?/add" use:enhance>
+	<label>
+		<span class="label">New category</span>
+		<input
+			type="text"
+			name="name"
+			bind:value={name}
+			placeholder="e.g. Boissons"
+			autocomplete="off"
+		/>
+	</label>
+	<button type="submit">Add</button>
+</form>
+
+{#if form?.error}
+	<p class="error">{form.error}</p>
+{/if}
+
+<form method="POST" action="?/delete" use:enhance>
+	<ul class="item-list">
+		{#each data?.categories ?? [] as cat (cat.id)}
+			<li class="catalog-item">
+				<span class="cat-name">{cat.name}</span>
+				<button class="delete-btn" name="id" value={cat.id} type="submit">
+					&times;
+				</button>
+			</li>
+		{/each}
+	</ul>
+</form>
+
+{#if (data?.categories?.length ?? 0) === 0}
+	<p class="empty">No categories yet</p>
+{/if}
+
+<style>
+	.add-form {
+		display: flex;
+		flex-direction: column;
+		gap: 0.5rem;
+		margin-bottom: 1rem;
+	}
+
+	.add-form label {
+		display: flex;
+		flex-direction: column;
+		gap: 0.25rem;
+	}
+
+	.label {
+		font-size: 0.75rem;
+		font-weight: 600;
+		text-transform: uppercase;
+		color: #999;
+	}
+
+	input {
+		padding: 0.75rem;
+		border: 1px solid #ccc;
+		border-radius: 0.5rem;
+		font-size: 1rem;
+	}
+
+	.add-form button[type='submit'] {
+		padding: 0.75rem 1.25rem;
+		border: none;
+		border-radius: 0.5rem;
+		background: #333;
+		color: #fff;
+		font-size: 1rem;
+		align-self: flex-start;
+	}
+
+	.error {
+		color: #d00;
+		margin-top: -0.5rem;
+		margin-bottom: 1rem;
+	}
+
+	.item-list {
+		list-style: none;
+		display: flex;
+		flex-direction: column;
+		gap: 0.25rem;
+	}
+
+	.catalog-item {
+		display: flex;
+		gap: 0.25rem;
+		height: 2rem;
+		align-items: center;
+	}
+
+	.cat-name {
+		flex-grow: 1;
+		padding: 0 0.75rem;
+	}
+
+	.delete-btn {
+		border: 1px solid #e0e0e0;
+		border-radius: 0.5rem;
+		background: #fff;
+		color: #d00;
+		transition: background 0.15s;
+		width: 2rem;
+		aspect-ratio: 1;
+		padding: 0;
+		display: flex;
+		align-items: center;
+		justify-content: center;
+		font-size: 1.25rem;
+		cursor: pointer;
+	}
+
+	.delete-btn:hover {
+		background: #fee;
+	}
+
+	.empty {
+		color: #999;
+		font-size: 0.875rem;
+		margin-top: 0.5rem;
+	}
+</style>