feat: Wallpapers built into the Media Hub

- Thanks @TaylanTatli for the inspiration

PLUGINS/LauncherExample/README.md

@@ -88,41 +88,13 @@ function executeItem(item): void
 ```javascript
 {
     name: "Item Name",           // Display name
-    icon: "icon_name",           // Icon (optional, see Icon Types below)
+    icon: "icon_name",           // Material icon
     comment: "Description",      // Subtitle text
     action: "type:data",         // Action to execute
     categories: ["PluginName"]   // Category array
 }
 ```
 
-**Icon Types**:
-
-The `icon` field supports three formats:
-
-1. **Material Design Icons** - Use `material:` prefix:
-   ```javascript
-   icon: "material:lightbulb"  // Material Symbols Rounded font
-   ```
-   Examples: `material:star`, `material:favorite`, `material:settings`
-
-2. **Desktop Theme Icons** - Use icon name directly:
-   ```javascript
-   icon: "firefox"  // Uses system icon theme
-   ```
-   Examples: `firefox`, `chrome`, `folder`, `text-editor`
-
-3. **No Icon** - Omit the `icon` field entirely:
-   ```javascript
-   {
-       name: "😀  Grinning Face",
-       // No icon field
-       comment: "Copy emoji",
-       action: "copy:😀",
-       categories: ["MyPlugin"]
-   }
-   ```
-   Perfect for emoji pickers or text-only items where the icon area should be hidden
-
 **Action Format**: `type:data` where:
 - `type` - Action handler (toast, copy, script, etc.)
 - `data` - Action-specific data