feat(hot-reload): Add trigger integration for hot reload system

- Task 1.1: Added _hot_reload_error state to App.__init__
- Task 1.2: Added _trigger_hot_reload() method to App
- Task 1.3: Added Ctrl+Alt+R keyboard capture in _gui_func()
- Task 1.4: Registered src.gui_2 with HotReloader in App.__init__
- Task 1.5: Added Hot Reload button in _render_mma_global_controls
- Tests: Added test_hot_reload_integration.py with 13 passing tests

src/gui_2.py

@@ -117,6 +117,13 @@ class App:
   self._is_applying_snapshot: bool = False
   # --- Initialization ---
   self.controller.init_state()
+  from src.hot_reloader import HotReloader, HotModule
+  HotReloader.register(HotModule(
+   name='src.gui_2',
+   file_path=__file__,
+   state_keys=['active_discussion', 'show_windows', 'ui_file_paths', 'ui_screenshot_paths', 'disc_entries', 'disc_roles'],
+   delegation_targets=['_render_main_interface', '_render_discussion_hub', '_render_files_and_media', '_render_ai_settings_hub', '_render_operations_hub', '_render_mma_dashboard']
+  ))
   self.workspace_manager = workspace_manager.WorkspaceManager(project_root=self.controller.active_project_root)
   self.disc_entries = self.controller.disc_entries
   self.disc_roles = self.controller.disc_roles
@@ -249,6 +256,7 @@ class App:
   self.ui_crt_filter = False
   self.ui_tool_filter_category = "All"
   self.shader_uniforms = {'crt': 1.0, 'scanline': 0.5, 'bloom': 0.8}
+  self._hot_reload_error: Optional[str] = None
 
  def _simulate_save_preset(self, name: str) -> None:
   from src import models
@@ -265,6 +273,12 @@ class App:
  def _post_init(self) -> None:
   theme.apply_current()
 
+ def _trigger_hot_reload(self) -> bool:
+  from src.hot_reloader import HotReloader
+  result = HotReloader.reload_all(self)
+  self._hot_reload_error = HotReloader.last_error
+  return result
+
  def run(self) -> None:
   """
   
@@ -734,6 +748,10 @@ class App:
      imgui.close_current_popup()
 
  def _gui_func(self) -> None:
+  io = imgui.get_io()
+  if io.key_ctrl and io.key_alt and io.keys_down[ord('R')]:
+   self._trigger_hot_reload()
+
   self._render_custom_title_bar()
   self._render_shader_live_editor()
   self._render_history_window()
@@ -4879,6 +4897,16 @@ def hello():
    c = vec4(255, 72, 64, alpha) if theme.is_nerv_active() else imgui.ImVec4(1, 0.3, 0.3, alpha)
    imgui.same_line(); imgui.text_colored(c, "  APPROVAL PENDING"); imgui.same_line()
    if imgui.button("Go to Approval"): pass
+  imgui.separator()
+  imgui.text("Hot Reload:")
+  imgui.same_line()
+  if imgui.button("Reload GUI"):
+   success = self._trigger_hot_reload()
+   if success:
+    imgui.text_colored(imgui.ImVec4(0, 1, 0, 1), "Reloaded!")
+   else:
+    imgui.text_colored(imgui.ImVec4(1, 0, 0, 1), f"Error: {self._hot_reload_error or 'Unknown'}")
+  imgui.same_line(); imgui.text_disabled("(Ctrl+Alt+R)")
 
  def _render_mma_usage_section(self) -> None:
   """