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

boards/esp32-32e/esp32-32e.ino

@@ -28,18 +28,32 @@ void loop() {
 
     // ── Touch handling ──
     const ScreenState& st = logic.getScreenState();
+    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) {
+            TouchEvent t = display.readTouch();
+            holdStartX = t.x;
+            holdStartY = t.y;
+        }
+        if (!h.active && holdStartX >= 0) {
+            display.updateHint(holdStartX, holdStartY);
         }
     } else {
+        holdStartX = -1;
+        holdStartY = -1;
+    }
+
+    if (st.screen == ScreenID::DASHBOARD) {
         TouchEvent evt = display.readTouch();
-        if (evt.pressed && st.screen == ScreenID::DASHBOARD) {
+        if (evt.pressed) {
             int tile = display.dashboardTouch(evt.x, evt.y);
             if (tile >= 0) Serial.printf("[DASH] Tile %d tapped\n", tile);
         }