test: wait for completed navigation before opening menus

Require the actual message article to own focus instead of matching body text. Wait for project runtime initialization before opening dismiss-on-blur composer options. Preserve all capture and native command assertions. Complete frozen Linux snapshot: 5371 passed, 51 skipped; focused Windows, typecheck and lint passed.

src/renderer/src/App.test.tsx

@@ -9256,6 +9256,11 @@ describe("App", () => {
 
     render(<App />);
 
+    await waitFor(() => expect(api.runtimeCustomization.getNativeSnapshot).toHaveBeenCalledWith(
+      expect.objectContaining({ provider: "opencode", projectId }),
+    ));
+    // Let startup selection and its focus effects finish before opening these options.
+    await act(async () => { await new Promise<void>((resolve) => requestAnimationFrame(() => resolve())); });
     openComposerOptions();
     const agentPicker = await screen.findByRole("button", {
       name: /OpenCode Runtime Agent/u,