feat: loading indicator

src/designer/loading_indicator.ui

@@ -0,0 +1,63 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>LoadingIndicator</class>
+ <widget class="QWidget" name="LoadingIndicator">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>795</width>
+    <height>653</height>
+   </rect>
+  </property>
+  <layout class="QGridLayout" name="gridLayout">
+   <item row="1" column="0">
+    <widget class="QProgressBar" name="progressBar">
+     <property name="maximumSize">
+      <size>
+       <width>500</width>
+       <height>16777215</height>
+      </size>
+     </property>
+     <property name="value">
+      <number>24</number>
+     </property>
+     <property name="textVisible">
+      <bool>true</bool>
+     </property>
+     <property name="format">
+      <string>%v/%m</string>
+     </property>
+    </widget>
+   </item>
+   <item row="2" column="0">
+    <spacer name="verticalSpacer">
+     <property name="orientation">
+      <enum>Qt::Orientation::Vertical</enum>
+     </property>
+     <property name="sizeHint" stdset="0">
+      <size>
+       <width>20</width>
+       <height>40</height>
+      </size>
+     </property>
+    </spacer>
+   </item>
+   <item row="0" column="0">
+    <spacer name="verticalSpacer_2">
+     <property name="orientation">
+      <enum>Qt::Orientation::Vertical</enum>
+     </property>
+     <property name="sizeHint" stdset="0">
+      <size>
+       <width>20</width>
+       <height>40</height>
+      </size>
+     </property>
+    </spacer>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>