Fix multi-word category pages never matching their own articles

/category/x-news filtered by the raw URL slug ("x-news") instead of the
real category name ("X News"), so it never matched merged_articles.category
values for any multi-word category — only worked for the seeded defaults
because they're all single words where the slug and name happen to be
identical once lowercased. Now resolves the slug back to the actual
category name via the site's own category list before filtering.

frontend/src/routes/category/[name]/+page.ts

@@ -1,14 +1,25 @@
 import type { PageLoad } from './$types';
 import { getFeed } from '$lib/api';
+import { slugify } from '$lib/format';
 
 const PAGE_SIZE = 15;
 
 // Every category page (including "Local") filters by its category name — sources are
 // assigned categories directly via checkboxes in the admin Sources tab, so a source
 // tagged "Local" shows up here the same way one tagged "Tech" shows up on /category/tech.
-export const load: PageLoad = async ({ params, fetch }) => {
-	const name = params.name;
-	const filters = { category: name };
+//
+// The URL param is a slug (e.g. "x-news" from slugify("X News")), not the real category
+// name — for single-word categories those happen to be the same lowercased, but for a
+// multi-word name like "X News" the slug's hyphen never matches the stored "X News"
+// (with a space) in a merged_articles.category LIKE match. Resolve the slug back to the
+// real category name via the site's own category list (already loaded by the root
+// layout) before filtering, rather than passing the raw slug straight through.
+export const load: PageLoad = async ({ params, fetch, parent }) => {
+	const { categories } = await parent();
+	const match = categories.find((c) => slugify(c.name) === params.name);
+	const categoryName = match?.name ?? params.name;
+
+	const filters = { category: categoryName };
 	const initial = await getFeed({ ...filters, limit: PAGE_SIZE }, fetch);
-	return { initial, filters, name, pageSize: PAGE_SIZE };
+	return { initial, filters, name: categoryName, pageSize: PAGE_SIZE };
 };