Refactor code completion, container layouts, and webkit settings

- Renamed alt_provider.py file under words completer
- Improve word completion matching logic with character validation
- Change container orientations (header→vertical, left/right→horizontal)
- Add separators to all container edges
- Refactor webkit UI loading into separate load_url/load_context_base_path methods
- Add comprehensive webkit browser-like settings

src/core/containers/footer_container.py

@@ -6,6 +6,7 @@ gi.require_version('Gtk', '3.0')
 from gi.repository import Gtk
 
 # Application imports
+from ..widgets.separator_widget import Separator
 from .code.code_container import CodeContainer
 
 
@@ -39,3 +40,5 @@ class FooterContainer(Gtk.Box):
         widget_registery.expose_object("footer-container", self)
 
         self.add( CodeContainer() )
+
+        self.add( Separator("separator-footer", 0) )