test(billing): harden personal→team gate test against cold-run emit race (FE-991)

The new container gate test could fail on a cold-cache first run (onChooseTeam
observed 0 calls) due to a userEvent/happy-dom event-dispatch warm-up race; the
gate source is synchronous and correct. Wrap the positive assertions in
vi.waitFor so the emit lands deterministically.

src/platform/workspace/components/SubscriptionRequiredDialogContentUnified.test.ts

@@ -97,7 +97,9 @@ describe('SubscriptionRequiredDialogContentUnified team-plan gate', () => {
 
     await user.click(screen.getByTestId('subscribe-team-btn'))
 
-    expect(onChooseTeam).toHaveBeenCalledOnce()
+    await vi.waitFor(() => {
+      expect(onChooseTeam).toHaveBeenCalledOnce()
+    })
     expect(mockHandleSubscribeTeamClick).not.toHaveBeenCalled()
   })
 
@@ -109,7 +111,9 @@ describe('SubscriptionRequiredDialogContentUnified team-plan gate', () => {
 
     await user.click(screen.getByTestId('subscribe-team-btn'))
 
-    expect(mockHandleSubscribeTeamClick).toHaveBeenCalledWith(TEAM_PAYLOAD)
+    await vi.waitFor(() => {
+      expect(mockHandleSubscribeTeamClick).toHaveBeenCalledWith(TEAM_PAYLOAD)
+    })
     expect(onChooseTeam).not.toHaveBeenCalled()
   })
 })