tui: Q&D adaptation to new code:

use the new `quick_bridge` adapter and do few changes to make TUI work with new backend.
TUI will probably be rewritten at some point, this is just an update to keep it working.

`urwid` has been updated to have a version working with Python 3.14.

libervia/tui/notify.py

@@ -17,7 +17,10 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-import dbus
+try:
+    import dbus
+except ImportError:
+    dbus = None
 
 
 class Notify(object):