✨ feat: add vibration feedback support for UI events

- Add genericVibration class with 5-second cooldown and 1-second pulse
- Integrate vibration triggers for new messages and contact discoveries
- Add conditional compilation support with PIN_VIBRATION guard
- Implement abstract interface for vibration in UITask system

src/helpers/ui/vibration.cpp

@@ -0,0 +1,43 @@
+#ifdef PIN_VIBRATION
+#include "vibration.h"
+
+void genericVibration::begin()
+{
+    pinMode(PIN_VIBRATION, OUTPUT);
+    digitalWrite(PIN_VIBRATION, LOW);
+    duration = 0;
+}
+
+void genericVibration::trigger()
+{
+    duration = millis();
+    digitalWrite(PIN_VIBRATION, HIGH);
+}
+
+void genericVibration::loop()
+{
+    if (isVibrating()) {
+        if ((millis() / 1000) % 2 == 0) {
+            digitalWrite(PIN_VIBRATION, LOW);
+        } else {
+            digitalWrite(PIN_VIBRATION, HIGH);
+        }
+
+        if (millis() - duration > VIBRATION_TIMEOUT) {
+            stop();
+        }
+    }
+}
+
+bool genericVibration::isVibrating()
+{
+    return duration > 0;
+}
+
+void genericVibration::stop()
+{
+    duration = 0;
+    digitalWrite(PIN_VIBRATION, LOW);
+}
+
+#endif // ifdef PIN_VIBRATION