test: stabilize asynchronous UI checks in release CI

Control the native inventory retry response and wait for the complete
browser-close result instead of asserting on intermediate renders.
Run native note-layout input in a visible isolated Electron window,
scan the fixture dependencies up front, and report timeout explicitly.
Keep all behavior and geometry assertions and Electron sandboxing.

The three focused regressions, full typecheck, and lint pass locally.
Linux CI must confirm the release failures are resolved. No product,
Agent, version, or release-tag changes are included.

src/renderer/src/App.test.tsx

@@ -9368,6 +9368,7 @@ describe("App", () => {
       supportsToolExecution: true, detail: "Ready",
     });
     const empty = await api.runtimeCustomization.getNativeSnapshot({ provider: "opencode" });
+    const retry = deferred<typeof empty>();
     vi.mocked(api.runtimeCustomization.getNativeSnapshot).mockClear();
     vi.mocked(api.runtimeCustomization.getNativeSnapshot)
       .mockResolvedValueOnce({
@@ -9375,18 +9376,26 @@ describe("App", () => {
         available: false,
         inventoryStatus: "unavailable",
       })
-      .mockResolvedValueOnce({
+      .mockReturnValueOnce(retry.promise);
+
+    render(<App />);
+
+    await waitFor(() =>
+      expect(api.runtimeCustomization.getNativeSnapshot).toHaveBeenCalledTimes(2),
+    );
+    openComposerOptions();
+    expect(screen.queryByRole("button", { name: /OpenCode Runtime Agent/u })).not.toBeInTheDocument();
+    await act(async () => {
+      retry.resolve({
         ...empty,
         available: true,
         inventoryStatus: "partial",
         agents: [{ id: "planner", name: "Planner", mode: "primary", native: true, hidden: false }],
         commands: [{ id: "review", name: "review", source: "command" }],
       });
-
-    render(<App />);
-
-    openComposerOptions();
-    fireEvent.click(await screen.findByRole("button", { name: /OpenCode Runtime Agent/u }));
+      await retry.promise;
+    });
+    fireEvent.click(screen.getByRole("button", { name: /OpenCode Runtime Agent/u }));
     expect(screen.getByRole("menuitemradio", { name: /Planner/u })).toBeVisible();
     fireEvent.keyDown(screen.getByRole("menu", { name: "OpenCode Runtime Agent" }), { key: "Escape" });
     fireEvent.click(screen.getByRole("button", { name: /Runtime 快捷操作/u }));

src/renderer/src/RightAssistantSidebar.resize.test.tsx

@@ -1795,8 +1795,11 @@ describe('RightAssistantSidebar resizing', () => {
     ).toBeInTheDocument()
 
     fireEvent.click(screen.getByRole('button', { name: '关闭浏览器 · conversation-a' }))
-    await waitFor(() => expect(screen.queryByRole('tab', { name: '浏览器 · conversation-a' })).not.toBeInTheDocument())
-    expect(screen.queryByText('Close denied')).not.toBeInTheDocument()
+    await waitFor(() => {
+      expect(browserApi.closeTab).toHaveBeenCalledTimes(2)
+      expect(screen.queryByRole('tab', { name: '浏览器 · conversation-a' })).not.toBeInTheDocument()
+      expect(screen.queryByText('Close denied')).not.toBeInTheDocument()
+    })
   })
 
   it.each(['create', 'close'] as const)(