大纲不能保存草稿

[PurezentoW]

大纲不能保存成草稿，返回就都没了
还有能不能先生成一张看看效果，不然一下子全生成出来，然后发现都不满意

[HisMax]

Fixed: The outline auto-save now works even when recordId is missing.

Root cause: autoSaveOutline() silently returned when recordId was null, which could happen if the initial history creation in HomeView failed. Now it automatically creates a history record as a fallback before saving.

Also fixed onMounted to properly await the checkAndCreateHistory() call, ensuring the record exists before the watch triggers auto-save.