fix: resolve lint errors for v4 release

- Fix duplicate editorContainer declaration in renderer.js
- Add missing browser globals to eslint config (prompt, FileReader, etc.)
- Add global object for Jest test setup
- Replace path.basename with portable string split in logo preview

eslint.config.js

@@ -38,10 +38,30 @@ module.exports = [
         document: 'readonly',
         localStorage: 'readonly',
         alert: 'readonly',
+        prompt: 'readonly',
+        confirm: 'readonly',
         Event: 'readonly',
         CustomEvent: 'readonly',
         HTMLElement: 'readonly',
         MutationObserver: 'readonly',
+        TextEncoder: 'readonly',
+        FileReader: 'readonly',
+        requestAnimationFrame: 'readonly',
+        cancelAnimationFrame: 'readonly',
+        navigator: 'readonly',
+        location: 'readonly',
+        fetch: 'readonly',
+        URL: 'readonly',
+        Blob: 'readonly',
+        Image: 'readonly',
+        DragEvent: 'readonly',
+        ClipboardEvent: 'readonly',
+        KeyboardEvent: 'readonly',
+        MouseEvent: 'readonly',
+        NodeList: 'readonly',
+        HTMLInputElement: 'readonly',
+        HTMLTextAreaElement: 'readonly',
+        getComputedStyle: 'readonly',
         // Electron
         electronAPI: 'readonly',
         // Libraries
@@ -49,6 +69,8 @@ module.exports = [
         DOMPurify: 'readonly',
         hljs: 'readonly',
         mermaid: 'readonly',
+        // Node.js global object
+        global: 'writable',
         // Jest
         jest: 'readonly',
         describe: 'readonly',