feat(lsp): improve shutdown lifecycle and response handling

- Add explicit shutdown and exit requests to LSP client
- Rename initialized message to initialized notification
- Handle initialize → send initialized notification
- Handle shutdown → send exit notification

fix(lsp): delay client teardown to allow graceful shutdown
- Close LSP client and response handlers after timeout (GLib)

feat(vte): major terminal widget improvements
- Switch to spawn_async with full environment inheritance
- Improve PROMPT_COMMAND handling for cwd tracking (OSC7)
- Enable scrollback, disable audible bell, enable scroll-on-output
- Add clipboard shortcuts (Ctrl+Shift+C/V), middle-click paste
- Track current directory changes and update UI label
- Add proper signal wiring and cleanup on destroy

feat(ui): improve Plugins dialog behavior
- Make dialog non-modal and centered on parent window
- Auto-hide on focus loss and Ctrl+Shift+P shortcut
- Ensure proper destroy-with-parent behavior

refactor: add type hints and minor cleanup
- Add explicit typing for VteWidget fields
- Improve signal naming consistency
- Minor formatting and cleanup in folding and LSP modules

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"]