tooltip not rendered after switching to zotero

[zzhixin]

Steps to reproduce

1. Hover on a pandoc reference, click open in zotero in the popup tooltip;
2. Switch back to obsidian;
3. Hover on the pandoc reference, no tooltip rendered.

Temporary workaround (annoying)

After 2. reopen the obsidian page or scroll to vannish the pandoc reference and scroll back.

Expected behavior

Tooltip rendered after switching back from zotero to obsidian.

GIF

[flohse123]

I made tooltip-related improvements while working on Zotero freshness:

• tooltip can render immediately from current data
• background on-demand refresh updates tooltip content in place
• additional handling to reduce tooltip flicker/disappear behavior during editor rerenders

This may help the Zotero-switch tooltip rendering instability described here.

PR: #154