fix(phase3): Resolve remaining test failures and stabilize GUI

- Fixed
ullcontext NameError in gui_2.py.
- Corrected TestMMAApprovalIndicators to call real rendering methods on mock app.
- Updated 	est_history_manager.py to provide required context_files argument to UISnapshot.
- Stabilized 	est_z_negative_flows.py with robust polling for terminal response status and corrected field names.
- Cleaned up debug logging in 
ag_engine.py and pp_controller.py.

tests/test_z_negative_flows.py

@@ -25,12 +25,19 @@ def test_mock_malformed_json(live_gui) -> None:
 
  try:
   # Trigger generation
-  client.set_value("system_prompt_input", "Trigger malformed")
+  client.set_value("ai_input", "Trigger malformed")
   client.click("btn_gen_send")
 
-  # Wait for response
-  event = client.wait_for_event("response", timeout=15)
-  assert event is not None, "Did not receive response event"
+  # Wait for terminal response
+  event = None
+  start = time.time()
+  while time.time() - start < 30:
+   ev = client.wait_for_event("response", timeout=5)
+   if ev and ev.get("payload", {}).get("status") != "streaming...":
+    event = ev
+    break
+  
+  assert event is not None, "Did not receive terminal response event"
   assert event["payload"]["status"] == "error"
   assert "JSONDecodeError" in event["payload"]["text"] or "json" in event["payload"]["text"].lower()
  finally:
@@ -60,12 +67,19 @@ def test_mock_error_result(live_gui) -> None:
 
  try:
   # Trigger generation
-  client.set_value("system_prompt_input", "Trigger error")
+  client.set_value("ai_input", "Trigger error")
   client.click("btn_gen_send")
 
-  # Wait for response
-  event = client.wait_for_event("response", timeout=15)
-  assert event is not None, "Did not receive response event"
+  # Wait for terminal response
+  event = None
+  start = time.time()
+  while time.time() - start < 30:
+   ev = client.wait_for_event("response", timeout=5)
+   if ev and ev.get("payload", {}).get("status") != "streaming...":
+    event = ev
+    break
+  
+  assert event is not None, "Did not receive terminal response event"
   assert event["payload"]["status"] == "error"
   assert "Mock simulated error" in event["payload"]["text"]
  finally:
@@ -95,13 +109,19 @@ def test_mock_timeout(live_gui) -> None:
 
  try:
   # Trigger generation
-  client.set_value("system_prompt_input", "Trigger timeout")
+  client.set_value("ai_input", "Trigger timeout")
   client.click("btn_gen_send")
 
-  # Wait for response. Note: gemini_cli_adapter has a 60s timeout,
-  # but the mock might not actually hang for 60s if we adjust it or we wait for 65s here.
-  event = client.wait_for_event("response", timeout=70)
-  assert event is not None, "Did not receive response event"
+  # Wait for terminal response
+  event = None
+  start = time.time()
+  while time.time() - start < 80:
+   ev = client.wait_for_event("response", timeout=5)
+   if ev and ev.get("payload", {}).get("status") != "streaming...":
+    event = ev
+    break
+  
+  assert event is not None, "Did not receive terminal response event"
   assert event["payload"]["status"] == "error"
   assert "timeout" in event["payload"]["text"].lower()
  finally: