feat(NearbyScreen): waypoint/navigate from list, TIME filter, addWaypoint helper

NearbyScreen:
- Hold Enter on a list row now shows Navigate and Save waypoint directly,
  without entering the detail view first
- TIME added as the last filter slot (LEFT/RIGHT cycles Fav→ALL→…→Snsr→TIME);
  time-sort shows age in right column and sorts by last-heard descending
- Save waypoint also available from detail view Options menu

UITask:
- Extract addWaypoint() helper (two overloads: with/without explicit timestamp)
  consolidating the full()+add()+saveWaypoints()+alert pattern; TrailScreen
  and QuickMsgScreen updated to use it

Fixes:
- SoundNotifier.h: correct NodePrefs.h include path (../NodePrefs.h)
- kbAddSensorPlaceholders: dereference _kb pointer in SettingsScreen,
  QuickMsgScreen and BotScreen (signature changed to KeyboardWidget&)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

examples/companion_radio/ui-new/SettingsScreen.h

@@ -836,7 +836,7 @@ public:
       // can't overflow it on save.
       _kb->begin(p ? p->custom_msgs[slot] : "",
                 p ? (int)sizeof(p->custom_msgs[slot]) - 1 : KB_MAX_LEN);
-      kbAddSensorPlaceholders(_kb, &sensors);
+      kbAddSensorPlaceholders(*_kb, &sensors);
       return true;
     }
     return false;