refactor: Update ESLint configuration to use latest ECMAScript version and warn about indentation

eslint.config.js

@@ -5,7 +5,7 @@ export default [
     js.configs.recommended,
     {
         languageOptions: {
-            ecmaVersion: 2021,
+            ecmaVersion: 'latest',
             sourceType: 'module',
             globals: {
                 ...globals.browser,
@@ -14,7 +14,7 @@ export default [
         },
         rules: {
             'no-console': 'off',
-            indent: ['error', 4],
+            indent: ['warn', 4],
             'linebreak-style': ['error', 'unix'],
             quotes: ['error', 'single', { avoidEscape: true, allowTemplateLiterals: true }],
             semi: ['error', 'always'],

packages/artplayer-plugin-danmuku/src/setting.js

@@ -63,20 +63,22 @@ export default class Setting {
         art.on('fullscreenWeb', (state) => this.onFullscreen(state));
     }
 
-    static icons = {
-        $on,
-        $off,
-        $config,
-        $style,
-        $mode_0_off,
-        $mode_0_on,
-        $mode_1_off,
-        $mode_1_on,
-        $mode_2_off,
-        $mode_2_on,
-        $check_on,
-        $check_off,
-    };
+    static get icons() {
+        return {
+            $on,
+            $off,
+            $config,
+            $style,
+            $mode_0_off,
+            $mode_0_on,
+            $mode_1_off,
+            $mode_1_on,
+            $mode_2_off,
+            $mode_2_on,
+            $check_on,
+            $check_off,
+        };
+    }
 
     get option() {
         return this.danmuku.option;