perf(test): reduce hot-suite import and setup overhead

src/browser/pw-ai-state.ts

@@ -0,0 +1,9 @@
+let pwAiLoaded = false;
+
+export function markPwAiLoaded(): void {
+  pwAiLoaded = true;
+}
+
+export function isPwAiLoaded(): boolean {
+  return pwAiLoaded;
+}