Fix terminal connection test mock

Co-authored-by: Orca <help@stably.ai>

src/renderer/src/components/terminal-pane/pty-connection.test.ts

@@ -249,6 +249,7 @@ describe('connectPanePty', () => {
         pty: {
           signal: vi.fn(),
           ackColdRestore: vi.fn(),
+          onClearBufferRequest: vi.fn(() => vi.fn()),
           onSerializeBufferRequest: vi.fn(() => vi.fn()),
           declarePendingPaneSerializer: vi.fn().mockResolvedValue(1),
           settlePaneSerializer: vi.fn().mockResolvedValue(undefined),