holoviz/panel: Version 1.9.4

Panel 1.9.4 is a patch release focused on rendering robustness for ESM/React components, several Tabulator and Pipeline fixes, OAuth hardening, and stylesheet/loading reliability improvements. It also adds support for movable Tabulator columns. Many thanks to @TheoMathurin, @rimsha152007-dotcom, @ebarkhordar, @SimonHeybrock, @ahuang11, @Kkkakania, @EltonChang1, @hoxbro, @MarcSkovMadsen, @Coderambling, @SuMayaBee, @youdie006, @kyo5uke, @ghostiee-11 and @philippjfr for contributing to this release.

🚀 Features

• Support movable Tabulator columns (#8685)

🎨 UI Improvements

• Align loading spinner with panel-material-ui (#8686)

🐛 Bug Fixes

• Report the pre-edit value on Tabulator value events (#8714)
• Raise a clear type error for unsupported Perspective objects (#8720)
• Fix Tabulator starts and ends header filters (#8719)
• Ensure ESM component child views aren't created concurrently (#8713)
• Inline versioned stylesheets on the notebook update path (#8708)
• Resolve invisible slider title font color in Fast theme's light mode (#8704)
• Various ESM component robustness fixes (#8702)
• Reveal markup panes when their stylesheets fail to load or are replaced (#8700)
• Drain held events once connected (#8698)
• Fix Tabulator row_content in panel-material-ui dynamic Tabs (#8697)
• Claim the Document thread before running app code (#8693)
• Ensure explicitly set sizing options are respected (#8687)
• Fix Feed rendering all objects at once (#8667)
• Fix repeated Location sync mappings (#8660)
• Fix Tabulator page size handling (#8657)
• Fix Fast theme Progress indicator height (#8652)
• Return a clean 403 for unauthenticated WebSocket connections (#8639)
• Set Cache-Control: no-store on the Bokeh document page (#8636)
• Forward additional oauth_extra_params to the OAuth authorization endpoint (#8635)
• Ensure Pipeline ready parameter and next button stay in sync after using the previous button (#8633)
• Ensure Pipeline previous button sets the correct stage in the graph (#8630)

📚 Documentation

• Add panel-live-server to docs Extensions gallery (#8703)
• Clarify FileDropper upload progress indicator documentation (#8684)
• Fix reactive row count in interactivity tutorial (#8683)
• Expand layout sizing controls documentation (#8682)
• Add Spacer reference notebook (#8681)
• Add ESM components card to explanation Components section (#8673)
• Fix typo and optimize phrasing (#8665)
• Fix the "Could not open websocket" / multiple-accounts OAuth troubleshooting guide (#8637)
• Document that JSON embed files must be served over HTTP (#8632)