fix: 添加localStorage使用情况日志和QuotaExceededError处理

Author: Hronrad

src/utils/webdav.ts

@@ -89,5 +89,26 @@ export async function syncFromWebDAV(): Promise<void> {
     throw new Error('WebDAV 未配置')
 
   const result = await webdavRequest(config, 'GET')
-  localStorage.setItem('chatStorage', result.data || '{}')
+  const data = result.data || '{}'
+  
+  console.log(`[WebDAV] Downloaded size: ${(data.length / 1024).toFixed(2)} KB`)
+  
+  // 检查当前 localStorage 使用情况
+  let currentSize = 0
+  for (const key in localStorage) {
+    if (localStorage.hasOwnProperty(key))
+      currentSize += (localStorage[key]?.length || 0) + key.length
+  }
+  console.log(`[WebDAV] Current localStorage: ${(currentSize / 1024).toFixed(2)} KB`)
+  
+  try {
+    localStorage.setItem('chatStorage', data)
+    console.log('[WebDAV] Saved successfully')
+  }
+  catch (error: any) {
+    console.error('[WebDAV] Save error:', error)
+    if (error.name === 'QuotaExceededError')
+      throw new Error(`Safari存储空间不足 (需要${(data.length / 1024).toFixed(1)}KB)。请在Safari设置中清除网站数据`)
+    throw new Error(`保存失败: ${error.message}`)
+  }
 }