fix(renderer): add missing closing brace for redo IPC handler

The ipcRenderer.on('redo') callback was missing its closing });
introduced in a9e05d2, causing SyntaxError: Unexpected end of input.

Amit Haridas

src/renderer.js

@@ -2041,6 +2041,8 @@ ipcRenderer.on('redo', () => {
             redo(tab.editorView);
         }
     }
+});
+
 // Custom Preview CSS event handlers and trigger helpers
 function applyCustomPreviewCSS(cssContent) {
     let styleTag = document.getElementById('custom-preview-style');