feat: add a button that directly syncs db from webdav #76
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Since KOReader already supports syncing reading statistics via WebDAV, I add this button to provide a more convenient way for syncing. Users who have configured WebDAV sync can manually trigger a database synchronization when needed.
A new button has been added to the footbar.

On first use, or if a sync attempt fails, the user will be prompted to configure their WebDAV login information.
