games: collapse non-featured game chips behind +N more; slide-only flyout animation

src/routes/start/+page.svelte

@@ -69,7 +69,9 @@
 	const tileChildren = (t: Group) =>
 		filtering || expandedGroups[t.name]
 			? (t.children ?? [])
-			: (t.children ?? []).filter((c) => c.featured ?? true);
+			: (t.children ?? []).some((c) => c.featured)
+				? (t.children ?? []).filter((c) => c.featured)
+				: (t.children ?? []);
 	const hiddenChildren = (t: Group) => (t.children?.length ?? 0) - tileChildren(t).length;
 	// The links filter (f) also narrows the trackers; a group stays if it or a chip matches.
 	const shownTrackers = $derived.by(() => {