♻️ refactor: unify UI notification methods into single notify() function

Consolidates soundBuzzer() and triggerVibration() into a unified notify() method
that handles both audio and haptic feedback based on UIEventType.

examples/companion_radio/ui-orig/UITask.h

@@ -66,7 +66,7 @@ public:
   // from AbstractUITask
   void msgRead(int msgcount) override;
   void newMsg(uint8_t path_len, const char* from_name, const char* text, int msgcount) override;
-  void soundBuzzer(UIEventType bet = UIEventType::none) override;
+  void notify(UIEventType t = UIEventType::none) override;
   void loop() override;
 
   void shutdown(bool restart = false);