Gallery: 添加小米图标资源，替换菜单图标

- 新增 drawable/ic_mi_gallery2.xml (layer-list 引用 mi.png)
- menu_main action_mi_gallery 图标改为 ic_mi_gallery2

gallery/build.properties

@@ -1,8 +1,8 @@
 #Created by .winboll/winboll_app_build.gradle
-#Sat Jul 18 14:50:11 CST 2026
+#Sat Jul 18 15:20:58 CST 2026
 stageCount=16
 libraryProject=
 baseVersion=15.0
 publishVersion=15.0.15
-buildCount=22
+buildCount=23
 baseBetaVersion=15.0.16

gallery/src/main/res/drawable/ic_mi_gallery2.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android"
+    android:clickable="true">
+    <item 
+        android:left="0dp" 
+        android:top="0dp" 
+        android:right="0dp" 
+        android:bottom="0dp"
+        android:drawable="@drawable/mi"/>
+</layer-list>

gallery/src/main/res/menu/menu_main.xml

@@ -5,7 +5,7 @@
     <item
         android:id="@+id/action_mi_gallery"
         android:title="@string/mi_gallery"
-        android:icon="@drawable/ic_mi_gallery"
+        android:icon="@drawable/ic_mi_gallery2"
         app:showAsAction="ifRoom"/>
     
     <item