fix: make player search case-insensitive

Add 'mode: insensitive' to Prisma query for player search:
- Allows searching by partial name regardless of case
- Improves user experience when searching for players

src/app/api/players/search/route.ts

@@ -15,6 +15,7 @@ export async function GET(request: NextRequest) {
       where: {
         name: {
           contains: query,
+          mode: "insensitive",
         },
       },
       orderBy: { name: "asc" },