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/SoundNotifier.h

@@ -3,7 +3,7 @@
 // UITask::notify() don't create merge conflicts.
 #ifdef PIN_BUZZER
 #include <helpers/ui/buzzer.h>
-#include "NodePrefs.h"
+#include "../NodePrefs.h"
 
 class SoundNotifier {
   genericBuzzer&   _buz;