Fix Biome and Stylelint formatting so pnpm lint passes.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/extension/src/entrypoints/__tests__/background-interrupt.test.ts

@@ -1,4 +1,4 @@
-import { describe, it, expect, vi } from "vitest";
+import { describe, expect, it, vi } from "vitest";
 
 // `background.ts` is a WXT entrypoint that calls the global `defineBackground`
 // at module load. WXT injects that helper at build time via auto-imports;