fix(sidebar): adds missing className

[rluders]

Description

className was present on Sidebar, 'cause it extends div, but it wasn't working properly. This PR, adds the className to the end of CSS classes, as we have in other components.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

Breaking changes

No

How Has This Been Tested?

• Manual test

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change

Comparison is base (525b90d) 99.42% compared to head (54bf32b) 99.42%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #657   +/-   ##
=======================================
  Coverage   99.42%   99.42%           
=======================================
  Files         130      130           
  Lines        6439     6440    +1     
  Branches      481      481           
=======================================
+ Hits         6402     6403    +1     
  Misses         37       37           

Impacted Files	Coverage Δ
src/lib/components/Sidebar/Sidebar.tsx	100.00% <100.00%> (ø)
src/lib/theme/default.ts	100.00% <100.00%> (ø)

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