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/language_server_clients/lsp_manager/client/lsp_client_events.py

@@ -15,6 +15,8 @@ from ..dto.code.lsp.lsp_messages import definition_request
 from ..dto.code.lsp.lsp_messages import implementation_request
 from ..dto.code.lsp.lsp_messages import references_request
 from ..dto.code.lsp.lsp_messages import symbols_request
+from ..dto.code.lsp.lsp_messages import shutdown_request
+from ..dto.code.lsp.lsp_messages import exit_request
 
 
 
@@ -36,9 +38,15 @@ class LSPClientEvents:
         self._init_params["initializationOptions"] = self._init_opts
         self.send_request("initialize", self._init_params)
 
-    def send_initialized_message(self):
+    def send_initialized_notification(self):
         self.send_notification("initialized")
 
+    def send_shutdown_request(self):
+        self.send_request("shutdown")
+
+    def send_exit_notification(self):
+        self.send_notification("exit")
+
     def _lsp_did_open(self, data: dict):
         method = "textDocument/didOpen"
         params = didopen_notification["params"]

plugins/code/language_server_clients/lsp_manager/dto/code/lsp/lsp_messages.py

@@ -183,7 +183,6 @@ references_request = {
 	}
 }
 
-
 symbols_request = {
 	"method": "textDocument/documentSymbol",
 	"params": {
@@ -195,3 +194,14 @@ symbols_request = {
 	    }
 	}
 }
+
+shutdown_request = {
+	"method": "shutdown",
+	"params": None
+}
+
+exit_request = {
+	"method": "exit",
+	"params": None
+}
+

plugins/code/language_server_clients/lsp_manager/lsp_manager.py

@@ -1,6 +1,9 @@
 # Python imports
 
 # Lib imports
+import gi
+
+from gi.repository import GLib
 
 # Application imports
 from libs.controllers.controller_base import ControllerBase
@@ -109,8 +112,16 @@ class LSPManager(ControllerBase):
         return True
 
     def close_client(self, lang_id: str) -> bool:
-        self.client_manager.close_client(lang_id)
-        self.response_registry.close_handler(lang_id)
+        controller = self.client_manager.get_active_client()
+        controller.send_shutdown_request()
+
+        def _close():
+            self.client_manager.close_client(lang_id)
+            self.response_registry.close_handler(lang_id)
+
+            return False
+
+        GLib.timeout_add(5000, _close)
 
         return True
 

plugins/code/language_server_clients/lsp_manager/response_handlers/default.py

@@ -17,6 +17,10 @@ class DefaultHandler(BaseHandler):
 
     def handle(self, method: str, response, controller):
         match method:
+            case "initialize":
+                controller.send_initialized_notification()
+            case "shutdown":
+                controller.send_exit_notification()
             case "textDocument/completion":
                 self._handle_completion(response)
             case "textDocument/definition":