fix: 判断设备是否支持 `requestIdleCallback`

src/views/NewEmail.jsx

@@ -576,10 +576,12 @@ const NewEmail = () => {
   const idleCallbackId = useRef(null)
   const debouncedSave = useCallback(
     debounce((data) => {
-      idleCallbackId.current = window.requestIdleCallback(() => {
+      if ('requestIdleCallback' in window) {
-        console.log('Saving data (idle, debounced):', data)
+        idleCallbackId.current = window.requestIdleCallback(() => {
-        writeIndexDB([{ ...data, key: editorKey }], 'draft', 'mailbox')
+          console.log('Saving data (idle, debounced):', data)
-      })
+          writeIndexDB([{ ...data, key: editorKey }], 'draft', 'mailbox')
+        })
+      }
     }, 1500), //  1.5s
     [],
   )