Add missing tooltip for "Custom Properties" style category

[SGroe]

What is the bug or the crash?

Please add a tooltip to the style category "Custom Properties" in order to describe affected layer properties (variables, ...)!

This affects the copy/paste style with context menu and also the import/export style dialog.

I just tried to copy variables from one layer to another. Eventually, I realized that it is done with copying "Custom Properties". However, I am not sure if other layer properties are included.

Steps to reproduce the issue

1. Right click vector layer to open context menu
2. Styles
3. Copy style
4. Hover "Custom Properties"
5. See that there is no tooltip

Versions

QGIS version
3.34.3-Prizren
QGIS code revision
4737323
Qt version
5.15.3
Python version
3.9.18
GDAL/OGR version
3.8.3
PROJ version
9.3.1
EPSG Registry database version
v10.098 (2023-11-24)
GEOS version
3.12.1-CAPI-1.18.1
SQLite version
3.41.1
PDAL version
2.6.0
PostgreSQL client version
15.2
SpatiaLite version
5.1.0
QWT version
6.1.6
QScintilla2 version
2.13.4
OS version
Windows 10 Version 2009

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

No response

[SGroe]

Adding a category "Variables" may be useful