Enhance CLI layout with floating completion menu

- Updated the layout in HermesCLI to include a floating completion menu, improving user experience by providing real-time suggestions as users type.
- Refactored the layout structure to utilize FloatContainer, ensuring the input area remains accessible while displaying the completion menu dynamically.

cli.py

@@ -32,8 +32,9 @@ from prompt_toolkit.history import FileHistory
 from prompt_toolkit.styles import Style as PTStyle
 from prompt_toolkit.patch_stdout import patch_stdout
 from prompt_toolkit.application import Application
-from prompt_toolkit.layout import Layout, HSplit, Window, FormattedTextControl
+from prompt_toolkit.layout import Layout, HSplit, Window, FormattedTextControl, Float, FloatContainer
 from prompt_toolkit.layout.dimension import Dimension
+from prompt_toolkit.layout.menus import CompletionsMenu
 from prompt_toolkit.widgets import TextArea
 from prompt_toolkit.key_binding import KeyBindings
 from prompt_toolkit.completion import Completer, Completion
@@ -1654,13 +1655,22 @@ class HermesCLI:
             height=get_hint_height,
         )
         
-        # Layout with dynamic spacer and input at bottom
+        # Layout with dynamic spacer, input at bottom, and floating completion menu
         layout = Layout(
-            HSplit([
-                Window(height=0),  # Expands to push everything to bottom
-                spacer,
-                input_area,
-            ])
+            FloatContainer(
+                content=HSplit([
+                    Window(height=0),  # Expands to push everything to bottom
+                    spacer,
+                    input_area,
+                ]),
+                floats=[
+                    Float(
+                        xcursor=True,
+                        ycursor=True,
+                        content=CompletionsMenu(max_height=12, scroll_offset=1),
+                    )
+                ],
+            )
         )
         
         # Style for the application