dashboard: update relay UI optimistically

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

@@ -10,7 +10,7 @@
 using namespace esp_panel::drivers;
 using namespace esp_panel::board;
 
-static const char *DASHBOARD_VERSION = "0.0.6-immediate-relay-refresh";
+static const char *DASHBOARD_VERSION = "0.0.7-optimistic-relay-ui";
 
 // Update these if your Cargo ESP AP credentials are different.
 static const char *CARGO_WIFI_SSID = "OverlandController";
@@ -24,6 +24,7 @@ static lv_obj_t *outputs_label = nullptr;
 static lv_obj_t *relay_buttons[6] = {nullptr};
 static lv_obj_t *relay_button_labels[6] = {nullptr};
 static String relay_ids[6];
+static String relay_names[6];
 static bool relay_states[6] = {false};
 static int relay_count = 0;
 static lv_obj_t *system_label = nullptr;
@@ -127,7 +128,12 @@ static void relay_button_event_cb(lv_event_t *event)
     }
 
     String relay_id = relay_ids[index];
-    bool next_state = !relay_states[index];
+    bool previous_state = relay_states[index];
+    bool next_state = !previous_state;
+
+    relay_states[index] = next_state;
+    update_relay_buttons();
+    update_outputs_label_from_relays();
 
     String pending_text = "Sending relay command...\n";
     pending_text += relay_id;
@@ -138,9 +144,6 @@ static void relay_button_event_cb(lv_event_t *event)
     bool ok = post_relay_state(relay_id, next_state);
 
     if (ok) {
-        relay_states[index] = next_state;
-        update_relay_buttons();
-
         String optimistic_text = "Relay command sent\n";
         optimistic_text += relay_id;
         optimistic_text += " -> ";
@@ -151,10 +154,35 @@ static void relay_button_event_cb(lv_event_t *event)
         force_status_poll_now();
         poll_status_api();
     } else {
+        relay_states[index] = previous_state;
+        update_relay_buttons();
+        update_outputs_label_from_relays();
         set_label_text_if_changed(system_label, last_system_text, "Relay command failed");
     }
 }
 
+
+static void update_outputs_label_from_relays()
+{
+    String outputs = "";
+
+    for (int i = 0; i < relay_count && i < 6; i++) {
+        outputs += String(i + 1);
+        outputs += ". ";
+        outputs += relay_names[i].length() > 0 ? relay_names[i] : relay_ids[i];
+        outputs += ": ";
+        outputs += on_off(relay_states[i]);
+        outputs += "\n";
+    }
+
+    if (outputs.length() == 0) {
+        outputs = "No outputs reported";
+    }
+
+    status_model.outputs_text = outputs;
+    set_label_text_if_changed(outputs_label, last_outputs_text, outputs);
+}
+
 static void update_relay_buttons()
 {
     lvgl_port_lock(-1);
@@ -344,6 +372,7 @@ static void parse_status_json(const String &body)
 
         if (relay_count < 6 && enabled && available) {
             relay_ids[relay_count] = String(id);
+            relay_names[relay_count] = String(name);
             relay_states[relay_count] = state;
             relay_count++;
         }