refactor(phase5): Comprehensive stabilisation pass. De-duplicated App/Controller state, hardened session reset, and updated integration tests with deterministic polling.

tests/test_system_prompt_sim.py

@@ -1,13 +1,8 @@
 import pytest
+from src import ai_client
+from src.api_hook_client import ApiHookClient
 import time
 import os
-import sys
-
-# Ensure project root is in path for imports
-sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
-
-from src.api_hook_client import ApiHookClient
-from src import ai_client
 
 def test_system_prompt_sim(live_gui):
  """
@@ -22,6 +17,8 @@ def test_system_prompt_sim(live_gui):
  """
  _, gui_script = live_gui
  client = ApiHookClient()
+ client.click("btn_reset")
+ time.sleep(2)
  
  # 1. Use client.wait_for_server().
  assert client.wait_for_server(timeout=15), "Server failed to start in time"
@@ -71,4 +68,4 @@ def test_system_prompt_sim(live_gui):
  
  # Close it
  client.set_value('show_base_prompt_diff_modal', False)
- assert client.get_value('show_base_prompt_diff_modal') is False
+ assert client.get_value('show_base_prompt_diff_modal') is False