feat: 重构主窗口菜单，将系统相册入口移至图片浏览窗口

- MainActivity: 移除 action_gallery 按钮，替换为 action_mi_gallery (小米相册)
- MainActivity: 移除 action_reset_gallery 按钮及响应代码
- ImageViewerActivity: 新增 btn_gallery 按钮，点击当前浏览图片打开相册选择器
- menu_main: 删除 action_gallery 和 action_reset_gallery 菜单项
- drawable: ic_cover 颜色改为白色以适配暗色工具栏
- drawable: 新增 ic_mi_gallery (小米相册图标)，删除 ic_cover_reset
- strings: 新增 mi_gallery 字符串资源

gallery/src/main/java/cc/winboll/studio/gallery/ImageViewerActivity.java

@@ -12,6 +12,7 @@ import android.view.View;
 import android.view.View.OnTouchListener;
 import android.view.WindowManager;
 import android.widget.ImageButton;
+import android.widget.Toast;
 import androidx.viewpager.widget.ViewPager;
 import java.io.File;
 import java.util.ArrayList;
@@ -34,6 +35,7 @@ public class ImageViewerActivity extends Activity implements ViewPager.OnPageCha
     private ImageButton btnShare;
     private ImageButton btnInfo;
     private ImageButton btnBg;
+    private ImageButton btnGallery;
     private int bgType = 0;
     private GestureDetector gestureDetector;
     private TrashManager trashManager;
@@ -63,6 +65,8 @@ public class ImageViewerActivity extends Activity implements ViewPager.OnPageCha
         btnInfo = findViewById(R.id.btn_info);
         btnBg = findViewById(R.id.btn_bg);
         
+        btnGallery = findViewById(R.id.btn_gallery);
+        
         applyBg();
         
         ImagePagerAdapter adapter = new ImagePagerAdapter(imageUrls, bgType);
@@ -119,6 +123,20 @@ public class ImageViewerActivity extends Activity implements ViewPager.OnPageCha
                 switchBg();
             }
         });
+        
+        btnGallery.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Toast.makeText(ImageViewerActivity.this, "Gallery", Toast.LENGTH_SHORT).show();
+                if (imageUrls != null && currentPosition >= 0 && currentPosition < imageUrls.size()) {
+                    Uri imageUri = imageUrls.get(currentPosition);
+                    Intent intent = new Intent(Intent.ACTION_VIEW);
+                    intent.setDataAndType(imageUri, "image/*");
+                    intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
+                    startActivity(Intent.createChooser(intent, "打开相册"));
+                }
+            }
+        });
     }
     
     private void toggleToolbar() {

gallery/src/main/java/cc/winboll/studio/gallery/MainActivity.java

@@ -289,31 +289,12 @@ private void loadAlbums() {
     @Override
     public boolean onOptionsItemSelected(@NonNull MenuItem item) {
         int id = item.getItemId();
-        if (id == R.id.action_gallery) {
-            Intent intent = new Intent(Intent.ACTION_VIEW, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
+        if (id == R.id.action_mi_gallery) {
+            Toast.makeText(this, "Gallery clicked", Toast.LENGTH_SHORT).show();
+            Intent intent = new Intent(Intent.ACTION_MAIN);
+            intent.addCategory(Intent.CATEGORY_APP_GALLERY);
             startActivity(intent);
             return true;
-        } else if (id == R.id.action_reset_gallery) {
-            // 清除 图库/ACTION_VIEW 图片 Uri 的默认打开记录
-            PackageManager pm = getPackageManager();
-
-            // 构建和你跳转一模一样的 Intent
-            Intent clearIntent = new Intent(Intent.ACTION_VIEW, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
-
-            try {
-                // 仅在 API <= 30 时执行重置操作
-                if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.R) {
-                    String mimeType = clearIntent.resolveType(getContentResolver());
-                    pm.clearPackagePreferredActivities(mimeType);
-                    Toast.makeText(this, "已清除默认打开方式", Toast.LENGTH_SHORT).show();
-                } else {
-                    // API > 30 时，弹出提示说明适配限制
-                    Toast.makeText(this, "应用开发资源有限，本应用适配目标安卓版本为 (" + Build.VERSION_CODES.R + ")。", Toast.LENGTH_LONG).show();
-                }
-            } catch (SecurityException e) {
-                Toast.makeText(this, "需要授予重置默认应用权限，请在系统设置中开启", Toast.LENGTH_LONG).show();
-            }
-            return true;
         } else if (id == R.id.action_settings) {
             startActivity(new Intent(this, SettingsActivity.class));
             return true;