Revert "dashboard: queue latest relay target states"

This reverts commit e1bbe2c135.

firmware/esp32-s3-dashboard/esp32-s3-dashboard.ino

@@ -541,6 +541,7 @@ static void relay_button_event_cb(lv_event_t *event)
         pending_relay_previous_state[index] = previous_state;
     }
 
+    // Latest-state queue: rapid taps overwrite this relay's desired target.
     pending_relay_state[index] = next_state;
     relay_command_pending[index] = true;
 
@@ -574,6 +575,8 @@ static void process_pending_relay_command()
     bool next_state = pending_relay_state[index];
     bool previous_state = pending_relay_previous_state[index];
 
+    // Clear before posting. If the user taps again after this command returns,
+    // the new desired state will be queued as a fresh command.
     relay_command_pending[index] = false;
 
     bool ok = post_relay_state(relay_id, next_state);
@@ -581,7 +584,8 @@ static void process_pending_relay_command()
     if (ok) {
         set_label_text_if_changed(system_status_label, last_system_status_text, "Relay command sent");
     } else {
-        if (!relay_command_pending[index]) {
+        // Only revert if no newer desired state was queued for this relay.
+        if (!relay_command_pending[index] && index >= 0 && index < relay_count) {
             relay_states[index] = previous_state;
             update_relay_buttons();
         }