fix(browser): retry relay navigation after frame detach

Retry browser navigate once after transient frame-detached/target-closed errors by forcing a clean Playwright reconnect, so extension-relay sessions stay controllable across navigation swaps.

Closes #29431

src/browser/pw-tools-core.test-harness.ts

@@ -22,7 +22,9 @@ const sessionMocks = vi.hoisted(() => ({
     return currentPage;
   }),
   ensurePageState: vi.fn(() => pageState),
+  forceDisconnectPlaywrightForTarget: vi.fn(async () => {}),
   restoreRoleRefsForTarget: vi.fn(() => {}),
+  storeRoleRefsForTarget: vi.fn(() => {}),
   refLocator: vi.fn(() => {
     if (!currentRefLocator) {
       throw new Error("missing locator");