feat(display): draw hint animation at touch position instead of center

sketches/doorbell-touch/boards/esp32-s3-lcd-43/esp32-s3-lcd-43.ino

@@ -28,15 +28,32 @@ void loop() {
 
     const ScreenState& st = logic.getScreenState();
 
+    // Track initial hold position for hint
+    static int holdStartX = -1;
+    static int holdStartY = -1;
+
     if(st.deviceState == DeviceState::ALERTING) {
         HoldState h = display.updateHold(HOLD_TO_SILENCE_MS);
         if(h.completed) {
             logic.silenceAlert();
+            holdStartX = -1;
+            holdStartY = -1;
         }
-        if(!h.active) {
-            display.updateHint();
+        if(h.started) {
+            // Capture initial touch position
+            holdStartX = evt.x;
+            holdStartY = evt.y;
         }
-    } else if(evt.pressed) {
+        if(!h.active && holdStartX >= 0) {
+            display.updateHint(holdStartX, holdStartY);
+        }
+    } else {
+        // Reset when not alerting
+        holdStartX = -1;
+        holdStartY = -1;
+    }
+
+    if(evt.pressed) {
         if(st.screen == ScreenID::OFF) {
             // Tap in OFF mode → wake to DASHBOARD
             Serial.println("[TOUCH] OFF → DASHBOARD");
@@ -46,15 +63,12 @@ void loop() {
             int tile = display.dashboardTouch(evt.x, evt.y);
             if(tile >= 0) {
                 Serial.printf("[DASH] Tile %d tapped\n", tile);
-                // TODO: Handle tile actions
             }
         } else if(st.screen == ScreenID::ALERT) {
-            // Tap in ALERT mode → could dismiss or show more info
             Serial.println("[TOUCH] ALERT tap");
-            // For now, let's make tap do nothing (hold to silence only)
-            // Or: logic.dismissAlert();
         }
     }
+
     if(Serial.available()) {
         String cmd = Serial.readStringUntil('\n');
         cmd.trim();