fix: resolve biome lint errors in discovery files

Remove unused functions and imports from route tests, fix array index key
warnings in skeleton components, apply biome formatting.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/server/services/discovery.service.ts

@@ -1,6 +1,6 @@
 import { and, count, desc, eq, isNotNull, lt, sql } from "drizzle-orm";
 import { db as prodDb } from "../../db/index.ts";
-import { globalItems, setups, setupItems, users } from "../../db/schema.ts";
+import { globalItems, setupItems, setups, users } from "../../db/schema.ts";
 
 type Db = typeof prodDb;
 
@@ -44,10 +44,7 @@ export async function getPopularSetups(
 		.leftJoin(users, eq(users.id, setups.userId))
 		.where(eq(setups.isPublic, true))
 		.groupBy(setups.id, setups.name, setups.createdAt, users.displayName)
-		.orderBy(
-			desc(sql<number>`COUNT(${setupItems.id})`),
-			desc(setups.id),
-		)
+		.orderBy(desc(sql<number>`COUNT(${setupItems.id})`), desc(setups.id))
 		.limit(fetchLimit);
 
 	// Apply cursor filter in JS (composite cursor: itemCount_id)