feat: improve LSP lifecycle, terminal widget, and code folding support

- LSP:
  - Add shutdown and exit request/notification handling
  - Send initialized notification after initialize response
  - Gracefully close clients with delayed shutdown via GLib timeout
  - Fix LSP WS server ↔ Godot LSP communication flow

- Terminal (VteWidget):
  - Switch to async spawn with full environment inheritance
  - Add PROMPT_COMMAND OSC7 support for cwd tracking
  - Improve UX: scrollback, no audible bell, auto scroll
  - Implement clipboard shortcuts, selection copy, middle-click paste
  - Track cwd changes and update UI label
  - Add proper signal wiring and cleanup on destroy

- Code folding:
  - Add fold support for JS, HTML, CSS, JSON, C, C++, Go
  - Reset fold state safely when AST or filetype is unavailable

- UI (Plugins dialog):
  - Improve dialog behavior (non-modal, centered, transient)
  - Add focus-out auto-hide and Ctrl+Shift+P shortcut

- Misc:
  - Add type hints in VTE widget
  - Update TODOs (remove completed items, add LSP comm fix)
  - Add terminal plugin scaffolding

plugins/code/ui/terminals/plugin.py

@@ -0,0 +1,60 @@
+# Python imports
+
+# Lib imports
+
+# Application imports
+from libs.event_factory import Event_Factory, Code_Event_Types
+
+from plugins.plugin_types import PluginCode
+
+from .terminals_view import TerminalsView
+
+
+
+terminals_view = TerminalsView()
+
+
+
+class Plugin(PluginCode):
+    def __init__(self):
+        super(Plugin, self).__init__()
+
+
+    def _controller_message(self, event: Code_Event_Types.CodeEvent):
+        ...
+
+    def load(self):
+        footer = self.request_ui_element("footer-container")
+        footer.add( terminals_view )
+
+        self._manage_signals("register_command")
+
+    def unload(self):
+        self._manage_signals("unregister_command")
+        terminals_view.destroy()
+
+    def _manage_signals(self, action: str):
+        event = Event_Factory.create_event(action,
+            command_name = "terminals",
+            command      = Handler,
+            binding_mode = "released",
+            binding      = "<Control>."
+        )
+
+        self.emit_to("source_views", event)
+
+    def run(self):
+        ...
+ 
+
+class Handler:
+    @staticmethod
+    def execute(
+        view: any,
+        *args,
+        **kwargs
+    ):
+        logger.debug("Command: Terminal")
+        terminals_view.set_code_view(view)
+
+        terminals_view.hide() if terminals_view.is_visible() else terminals_view.show()