fix: wait for debounced focus effect to settle in ChatView test

The 'does not grab focus when follow-up question presented' test was
flaky on Windows due to timing issues with the 50ms debounced focus
effect. On Windows, the test could clear mockFocus before the initial
debounced effect fired, causing the effect to fire with stale state
after the clear.

Added explicit wait (100ms) after initial render to ensure the
debounced focus effect has completed before clearing mocks.

Author: hannesrudolph

webview-ui/src/components/chat/__tests__/ChatView.spec.tsx

@@ -490,6 +490,11 @@ describe("ChatView - Focus Grabbing Tests", () => {
 			expect(getByTestId("chat-textarea")).toBeInTheDocument()
 		})
 
+		// Wait for the debounced focus effect to fire (50ms debounce + buffer for CI variability)
+		await act(async () => {
+			await new Promise((resolve) => setTimeout(resolve, 100))
+		})
+
 		// Clear any initial calls after state has settled
 		mockFocus.mockClear()