feat(project): optimize image imports and converter

- Optimize imported scene preview images (smart WebP/JPEG/PNG, preserve alpha, keep pixel size)

- Update converter to re-encode existing image assets with same algorithm

- Improve import/export progress overlay and reduce presentation slide stutter

Made-with: Cursor

eslint.config.js

@@ -12,7 +12,18 @@ const tsProject = ['./tsconfig.eslint.json'];
 
 export default tseslint.config(
   {
-    ignores: ['dist/**', 'release/**', 'node_modules/**', '.cursor/**', 'scripts/**', 'eslint.config.js'],
+    ignores: [
+      'dist/**',
+      'release/**',
+      'node_modules/**',
+      '.cursor/**',
+      'scripts/**',
+      'tools/**',
+      'eslint.config.js',
+      // Plain ESM; shared with tools/project-converter (not parsed as TS project file).
+      'app/main/project/optimizeImageImport.lib.mjs',
+      'app/main/project/optimizeImageImport.lib.d.mts',
+    ],
   },
   js.configs.recommended,
   ...tseslint.configs.strictTypeChecked,