feat: loading indicator

src/loading_indicator.cpp

@@ -0,0 +1,16 @@
+/*
+ * @Author: Uyanide pywang0608@foxmail.com
+ * @Date: 2025-08-07 00:32:25
+ * @LastEditTime: 2025-08-07 01:09:49
+ * @Description: A loading indicator widget with a progress bar.
+ */
+#include "loading_indicator.h"
+
+LoadingIndicator::LoadingIndicator(QWidget *parent) : QWidget(parent),
+                                                      ui(new Ui::LoadingIndicator) {
+    ui->setupUi(this);
+}
+
+LoadingIndicator::~LoadingIndicator() {
+    delete ui;
+}