fix: hv.help() to work outside IPython/Jupyter

[AR21SM]

Description

Fixes #6775 - hv.help() now provides visualization options (Style Options, Plot Options) when running in plain Python scripts, not just in Jupyter notebooks.

Before

After

Checklist

• Pull request title follows the conventional format
• Tests added and is passing
• Added documentation

[AR21SM]

Hi @MarcSkovMadsen, I'm unable to edit the PR title from my end. Could you please change "Fix:" to "fix:" (lowercase) to pass the semantic PR title check? Thanks!

[AR21SM]

Thanks@hoxbro :)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.21%. Comparing base (191aa3b) to head (dd22828).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6793   +/-   ##
=======================================
  Coverage   89.21%   89.21%           
=======================================
  Files         334      334           
  Lines       72362    72364    +2     
=======================================
+ Hits        64559    64561    +2     
  Misses       7803     7803           

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[hoxbro]

I'm not sure why you have chosen to put it here

Placing it here will only make it work, after you have called hv.extension.

We also need to check whether this store will work on Windows cmd.exe (if you haven't already checked it).

[AR21SM]

The placement is intentional. hv.help() needs InfoPrinter.store to access Store.registry for Style/Plot options. This registry is only populated after hv.extension() loads a backend before that, there's nothing to show.

I've tested this on Windows cmd.exe and confirmed it works correctly.