implementing UI for bottom controls

src/ui/app.py

@@ -3,6 +3,7 @@ from textual.widgets import Footer
 
 from ui.widgets.sidebar import Sidebar
 from ui.widgets.timeline import Timeline
+from ui.widgets.project_settings import ProjectSettings
 
 
 class AppUI(App):    
@@ -13,4 +14,5 @@ class AppUI(App):
     def compose(self) -> ComposeResult:
         yield Sidebar()
         yield Timeline()
+        yield ProjectSettings()
         yield Footer()