fix(tui): stream /browser connect progress as gateway events

Emit browser.progress JSON-RPC notifications during the connect work and render them in the TUI as system transcript lines, so users see the same step-by-step status the base CLI prints instead of nothing for ~1m followed by a final result.

ui-tui/src/__tests__/createGatewayEventHandler.test.ts

@@ -293,6 +293,19 @@ describe('createGatewayEventHandler', () => {
     expect(appended[1]).toMatchObject({ role: 'assistant', text: 'final answer' })
   })
 
+  it('renders browser.progress events as system transcript lines as they stream in', () => {
+    const appended: Msg[] = []
+    const ctx = buildCtx(appended)
+    const handler = createGatewayEventHandler(ctx)
+
+    handler({
+      payload: { message: 'Chrome launched and listening on port 9222' },
+      type: 'browser.progress'
+    } as any)
+
+    expect(ctx.system.sys).toHaveBeenCalledWith('Chrome launched and listening on port 9222')
+  })
+
   it('annotates gateway.start_timeout with stderr tail lines so users can diagnose without /logs', () => {
     const appended: Msg[] = []
     const onEvent = createGatewayEventHandler(buildCtx(appended))