修复：close超时保护、移除冗余变量、优化文件大小计算、去重formatBytes

renderer/renderer.js

@@ -140,13 +140,15 @@
   }
 
   // ===== File Size =====
+  function formatBytes(bytes) {
+    if (bytes < 1024) return bytes + ' B';
+    if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(1) + ' KB';
+    return (bytes / (1024 * 1024)).toFixed(1) + ' MB';
+  }
+
   function updateFileSize() {
-    const bytes = new TextEncoder().encode(editor.value).length;
-    let display;
-    if (bytes < 1024) display = bytes + ' B';
-    else if (bytes < 1024 * 1024) display = (bytes / 1024).toFixed(1) + ' KB';
-    else display = (bytes / (1024 * 1024)).toFixed(1) + ' MB';
-    statusSize.textContent = display;
+    const bytes = new Blob([editor.value]).size;
+    statusSize.textContent = formatBytes(bytes);
     statusSizeDivider.classList.add('visible');
   }
 
@@ -215,12 +217,6 @@
     return filePath.split(/[/\\]/).pop();
   }
 
-  function formatBytes(bytes) {
-    if (bytes < 1024) return bytes + ' B';
-    if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(1) + ' KB';
-    return (bytes / (1024 * 1024)).toFixed(1) + ' MB';
-  }
-
   async function updateFileStats(filePath) {
     if (typeof window.electronAPI !== 'undefined' && filePath) {
       const stats = await window.electronAPI.getFileStats(filePath);