feat: Complete plugin lifecycle management with lazy loading and runtime reload

Major changes:
- Add unload() method to all plugins for proper cleanup (unregister commands/providers/LSP clients, destroy widgets, clear state)
- Implement lazy widget loading via "show" signal across all containers
- Add autoload: false manifest option for manual/conditional plugin loading
- Add Plugins UI with runtime load/unload toggle via Ctrl+Shift+p
- Implement controller unregistration system with proper signal disconnection
- Add new events: UnregisterCommandEvent, GetFilesEvent, GetSourceViewsEvent, TogglePluginsUiEvent
- Fix signal leaks by tracking and disconnecting handlers in widgets (search/replace, LSP manager, tabs, telescope, markdown preview)
- Add Save/Save As to tabs context menu
- Improve search/replace behavior (selection handling, focus management)
- Add telescope file initialization from existing loaded files
- Refactor plugin reload watcher to dynamically add/remove plugins on filesystem changes
- Add new plugins: file_history, extend_source_view_menu, godot_lsp_client
- Fix bug in prettify_json (undefined variable reference

plugins/code/ui/tabs_bar/tabs_controller.py

@@ -16,7 +16,6 @@ from .tab_widget import TabWidget
 
 
 
-
 class TabsController(ControllerBase):
     def __init__(self):
         super(TabsController, self).__init__()
@@ -35,7 +34,7 @@ class TabsController(ControllerBase):
         elif isinstance(event, Code_Event_Types.FileExternallyDeletedEvent):
             self.tabs_widget.externally_deleted( event.buffer )
         elif isinstance(event, Code_Event_Types.AddedNewFileEvent):
-            self.add_tab(event)
+            self.add_tab(event.file)
         elif isinstance(event, Code_Event_Types.PoppedFileEvent):
             ...
         elif isinstance(event, Code_Event_Types.RemovedFileEvent):
@@ -53,11 +52,11 @@ class TabsController(ControllerBase):
 
             break
 
-    def add_tab(self, event: Code_Event_Types.AddedNewFileEvent):
+    def add_tab(self, file):
         tab      = TabWidget()
-        tab.file = event.file
+        tab.file = file
 
-        tab.label.set_label(event.file.fname)
+        tab.label.set_label(file.fname)
 
         self.tabs_widget.append_page(Gtk.Separator(), tab)
         tab.show_all()
@@ -73,3 +72,13 @@ class TabsController(ControllerBase):
             )
 
             break
+
+    def unload_tabs(self):
+        for page_widget in self.tabs_widget.get_children():
+            tab = self.tabs_widget.get_tab_label(page_widget)
+
+            tab.clear_signals_and_data()
+            self.tabs_widget.remove_page(
+                self.tabs_widget.page_num(page_widget)
+            )
+