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/code_fold/fold_types.py

@@ -25,6 +25,28 @@ FOLD_NODES = {
         "with_statement",
         "try_statement",
     },
+    "javascript": {
+        "function_declaration",
+        "class_declaration",
+        "if_statement",
+        "for_statement",
+        "while_statement",
+        "switch_statement",
+        "try_statement",
+    },
+    "html": {
+        "element",
+        "attribute",
+    },
+    "css": {
+        "rule_set",
+        "selector",
+        "declaration",
+    },
+    "json": {
+        "object",
+        "array",
+    },
     "java": {
         "class_declaration",
         "method_declaration",
@@ -35,8 +57,30 @@ FOLD_NODES = {
         "switch_expression",
         "block",
     },
-    "json": {
-        "object",
-        "array",
+    "c": {
+        "function_definition",
+        "struct_definition",
+        "if_statement",
+        "for_statement",
+        "while_statement",
+        "switch_statement",
     },
-}
+    "cpp": {
+        "function_definition",
+        "class_definition",
+        "struct_definition",
+        "namespace_definition",
+        "if_statement",
+        "for_statement",
+        "while_statement",
+        "switch_statement",
+    },
+    "go": {
+        "function_declaration",
+        "type_declaration",
+        "if_statement",
+        "for_statement",
+        "select_statement",
+        "switch_statement",
+    },
+}

plugins/code/ui/code_fold/plugin.py

@@ -25,15 +25,19 @@ class Plugin(PluginCode):
             self.view = event.view
 
             event = Event_Factory.create_event(
-                "get_file", buffer=self.view.get_buffer()
+                "get_file", buffer = self.view.get_buffer()
             )
             self.emit_to("files", event)
 
             file = event.response
 
             if not file: return
-            if file.ftype not in FOLD_NODES: return
-            if not hasattr(file, "ast"): return
+            if file.ftype not in FOLD_NODES:
+                self.view.fold_start_set = {}
+                return
+            if not hasattr(file, "ast"):
+                self.view.fold_start_set = {}
+                return
 
             buffer = file.buffer
             if not buffer.get_tag_table().lookup("invisible"):

plugins/code/ui/terminals/__init__.py

@@ -0,0 +1,3 @@
+"""
+    Pligin Module
+"""

plugins/code/ui/terminals/__main__.py

@@ -0,0 +1,3 @@
+"""
+    Pligin Package
+"""

plugins/code/ui/terminals/manifest.json

@@ -0,0 +1,7 @@
+{
+    "name": "Terminals",
+    "author": "ITDominator",
+    "version": "0.0.1",
+    "support": "",
+    "requests": {}
+}

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()

plugins/code/ui/terminals/terminals_view.py

@@ -0,0 +1,142 @@
+# Python imports
+
+# Lib imports
+import gi
+gi.require_version('Gtk', '3.0')
+gi.require_version('Gdk', '3.0')
+
+from gi.repository import Gtk
+from gi.repository import GLib
+from gi.repository import Gdk
+from gi.repository import Pango
+
+# Application imports
+from .vte_widget import VteWidget
+
+
+
+class TerminalsView(Gtk.Notebook):
+    def __init__(self):
+        super(TerminalsView, self).__init__()
+
+        self.code_view = None
+
+        self._setup_styling()
+        self._setup_signals()
+        self._load_widgets()
+
+        self.show_all()
+        self.hide()
+
+
+    def _setup_styling(self):
+        ctx = self.get_style_context()
+        ctx.add_class("terminals-view")
+
+        self.set_scrollable(True)
+
+    def _setup_signals(self):
+        self.connect("show", self._handle_show)
+        self.connect("hide", self._handle_hide)
+        self.connect("destroy", self._handle_destroy)
+
+    def _load_widgets(self):
+        hbox           = Gtk.Box()
+        self.add_bttn  = Gtk.Button(label = "✛")
+        self.hide_bttn = Gtk.Button(label = "－")
+        self.add_bttn.connect("clicked", self._create_terminal)
+        self.hide_bttn.connect("clicked", self._hide_view)
+
+        hbox.add(self.add_bttn)
+        hbox.add(self.hide_bttn)
+        self.set_action_widget(hbox, Gtk.PackType.END)
+
+        self.create_terminal()
+        hbox.show_all()
+
+    def _generate_terminal_parts(self):
+        label      = Gtk.Label(label = "...")
+        vte_widget = VteWidget()
+
+        vte_widget.hide_view       = self.hide
+        vte_widget.create_terminal = self.create_terminal
+        vte_widget.close_terminal  = self.close_terminal
+        vte_widget.prev_terminal   = self.prev_terminal
+        vte_widget.next_terminal   = self.next_terminal
+
+        label.set_text( vte_widget.get_home_path() )
+        label.set_tooltip_text( vte_widget.get_home_path() )
+        label.set_ellipsize(Pango.EllipsizeMode.START)
+        label.set_single_line_mode(True)
+        label.set_max_width_chars(32)
+        label.set_size_request(240, -1)
+
+        vte_widget.bind_label(label)
+
+        return label, vte_widget
+
+    def _handle_show(self, widget):
+        i    = widget.get_current_page()
+        term = widget.get_nth_page(i)
+
+        GLib.idle_add(term.grab_focus)
+
+    def _handle_hide(self, widget):
+        if not self.code_view: return
+        GLib.idle_add(self.code_view.grab_focus)
+
+    def _hide_view(self, widget):
+        self.hide()
+
+    def _handle_destroy(self, widget):
+        widget.disconnect_by_func(widget._handle_show)
+        widget.disconnect_by_func(widget._handle_hide)
+        widget.disconnect_by_func(widget._handle_destroy)
+        self.add_bttn.disconnect_by_func(self._create_terminal)
+        self.hide_bttn.disconnect_by_func(self._hide_view)
+
+    def _create_terminal(self, widget):
+        self.create_terminal()
+
+    def set_code_view(self, widget):
+        self.code_view = widget
+
+    def create_terminal(self):
+        label, vte_widget = self._generate_terminal_parts()
+        index = self.append_page(vte_widget, label)
+        self.set_tab_detachable(vte_widget, True)
+        self.set_tab_reorderable(vte_widget, True)
+
+        self.set_current_page(index)
+        GLib.idle_add(vte_widget.grab_focus)
+
+        self.show_all()
+
+    def close_terminal(self):
+        size = self.get_n_pages()
+        if size == 1: return
+
+        i     = self.get_current_page() 
+        widget = self.get_nth_page(i)
+        self.remove_page(i)
+        widget.destroy()
+
+    def prev_terminal(self):
+        i    = self.get_current_page() - 1
+        size = self.get_n_pages()
+
+        if i < 0:
+            self.set_current_page(size - 1)
+            return
+
+        self.prev_page()
+
+    def next_terminal(self):
+        i    = self.get_current_page() + 1
+        size = self.get_n_pages()
+
+        if i == size:
+            self.set_current_page(0)
+            return
+
+        self.next_page()

plugins/code/ui/terminals/vte_widget.py

@@ -0,0 +1,176 @@
+# Python imports
+import os
+from os import path
+
+# Lib imports
+import gi
+gi.require_version('Gtk', '3.0')
+gi.require_version('Gdk', '3.0')
+gi.require_version('Vte', '2.91')
+from gi.repository import Gtk
+from gi.repository import Gdk
+from gi.repository import GLib
+from gi.repository import Vte
+
+# Application imports
+
+
+
+class VteWidgetException(Exception):
+    ...
+
+
+
+class VteWidget(Vte.Terminal):
+    """
+        https://stackoverflow.com/questions/60454326/how-to-implement-a-linux-terminal-in-a-pygtk-app-like-vscode-and-pycharm-has
+    """
+
+    def __init__(self):
+        super(VteWidget, self).__init__()
+
+        self._USER_HOME: str = path.expanduser('~')
+
+        self._setup_styling()
+        self._setup_signals()
+        self._subscribe_to_events()
+        self._load_widgets()
+        self._do_session_spawn()
+
+        self.show()
+
+
+    def _setup_styling(self):
+        ctx = self.get_style_context()
+        ctx.add_class("vte-widget")
+
+        self.set_clear_background(False)
+        self.set_hexpand(True)
+        self.set_enable_sixel(True)
+        self.set_cursor_shape( Vte.CursorShape.IBEAM )
+        self.set_audible_bell(False)
+        self.set_scroll_on_output(True)
+
+    def _setup_signals(self):
+        self.connect("commit", self._handle_commit)
+        self.connect("current-directory-uri-changed", self._handle_path_change)
+        self.connect("selection-changed", self._handle_selection)
+        self.connect("button-press-event", self._on_button_press)
+        self.connect("key-press-event", self._on_key_press)
+        self.connect("key-release-event", self._on_key_release)
+        self.connect("destroy", self._handle_destroy)
+
+    def _subscribe_to_events(self):
+        ...
+
+    def _load_widgets(self):
+        ...
+
+    def _do_session_spawn(self):
+        env_dict    = os.environ.copy()
+        existing_pc = env_dict.get("PROMPT_COMMAND", "")
+        # Note: Needed for 'current-directory-uri-changed' to work.
+        #       Make sure user .bashrc doesn't affect it...
+        osc7        = 'printf "\\033]7;file://%s%s\\007" "$PWD"'
+
+        env_dict.update({
+            "LC_ALL": "C",
+            "TERM": "xterm-256color",
+            "HISTFILE": "/dev/null",
+            "HISTSIZE": "0",
+            "HISTFILESIZE": "0",
+            "PS1": "\\h@\\u \\W -->: ",
+            "PROMPT_COMMAND": f"{osc7};{existing_pc}" if existing_pc else osc7,
+        })
+
+        env = [f"{k}={v}" for k, v in env_dict.items()]
+
+        self.spawn_async(
+            Vte.PtyFlags.DEFAULT,
+            self._USER_HOME,
+            ["/bin/bash"],
+            env,
+            GLib.SpawnFlags.DEFAULT,
+            None, None, -1, None, None,
+        )
+
+        self.set_scrollback_lines(15000)
+
+    def _handle_destroy(self, terminal):
+        logger.debug("Destroying terminal...")
+        terminal.disconnect_by_func(terminal._handle_commit)
+        terminal.disconnect_by_func(terminal._handle_path_change)
+        terminal.disconnect_by_func(terminal._handle_selection)
+        terminal.disconnect_by_func(terminal._on_button_press)
+        terminal.disconnect_by_func(terminal._on_key_press)
+        terminal.disconnect_by_func(terminal._on_key_release)
+        terminal.disconnect_by_func(terminal._handle_destroy)
+
+    def _handle_commit(self, terminal, text, size):
+        ...
+
+    def _handle_selection(self, *args):
+        if self.get_has_selection():
+            self.copy_primary()
+
+    def _on_button_press(self, widget, event):
+        if event.button == 2:  # middle click
+            self.paste_clipboard()
+            return True
+
+    def _on_key_press(self, widget, event):
+        ctrl_pressed  = event.state & Gdk.ModifierType.CONTROL_MASK
+        shift_pressed = event.state & Gdk.ModifierType.SHIFT_MASK
+
+        if ctrl_pressed:
+            if shift_pressed:
+                if event.keyval in [Gdk.KEY_C, Gdk.KEY_V]:
+                    if event.keyval == Gdk.KEY_C:
+                        self.copy_clipboard()
+                    elif event.keyval == Gdk.KEY_V:
+                        self.paste_clipboard()
+
+                    return True
+
+            if event.keyval in [
+                Gdk.KEY_period, Gdk.KEY_t, Gdk.KEY_w, Gdk.KEY_Up, Gdk.KEY_Down
+            ]:
+                if event.keyval == Gdk.KEY_period:
+                    if hasattr(self, "hide_view"):
+                        GLib.timeout_add(200, self.hide_view)
+                elif event.keyval == Gdk.KEY_t:
+                    if hasattr(self, "create_terminal"):
+                        self.create_terminal()
+                elif event.keyval == Gdk.KEY_w:
+                    if hasattr(self, "close_terminal"):
+                        self.close_terminal()
+                elif event.keyval == Gdk.KEY_Up:
+                    if hasattr(self, "prev_terminal"):
+                        self.prev_terminal()
+                elif event.keyval == Gdk.KEY_Down:
+                    if hasattr(self, "next_terminal"):
+                        self.next_terminal()
+
+                return True
+
+        return False
+
+    def _on_key_release(self, widget, event):
+        ...
+
+    def _handle_path_change(self, terminal):
+        if not hasattr(self, "label"): return
+
+        uri = terminal.get_current_directory_uri().replace("file://", "")
+
+        terminal.label.set_text(uri)
+        terminal.label.set_tooltip_text(uri)
+
+    def get_home_path(self):
+        return self._USER_HOME
+
+    def bind_label(self, label: Gtk.Label):
+        self.label = label
+
+    def run_command(self, cmd: str):
+        self.feed_child_binary(bytes(cmd, 'utf8'))