Fix: Class diagram namespaces black lines, not responding to theme variables

[yari-dewalt]

📑 Summary

Gets rid of the default black line and transparent background styling of namespaces in class diagrams. This way the cluster is visually more consistent with other diagrams' clusters and is responsive to themes and custom theme variables.

Resolves #5669

📏 Design Decisions

Added common cluster styles from other diagrams and removed the hard coded cssStyles being applied to the namespace nodes.

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 21 lines in your changes missing coverage. Please review.

Project coverage is 3.88%. Comparing base (446f6a7) to head (47297f7).

Files with missing lines	Patch %	Lines
packages/mermaid/src/diagrams/class/styles.js	0.00%	20 Missing ⚠️
packages/mermaid/src/diagrams/class/classDb.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #6026      +/-   ##
==========================================
- Coverage     3.88%   3.88%   -0.01%     
==========================================
  Files          399     399              
  Lines        42055   42075      +20     
  Branches       638     638              
==========================================
  Hits          1635    1635              
- Misses       40420   40440      +20     

Flag	Coverage Δ
unit	3.88% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
packages/mermaid/src/diagrams/class/classDb.ts	0.00% <0.00%> (ø)
packages/mermaid/src/diagrams/class/styles.js	0.00% <0.00%> (ø)

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Build	Status	Details	Updated (UTC)
default (Inspect)	⚠️ Changes detected (Review)	7 changed	Feb 26, 2025, 5:59 PM

[jgreywolf]

@yari-dewalt Can you make sure to follow up on the failures listed?

[jgreywolf]

@yari-dewalt What is the status of this? Getting ready to make a slate of changes and figure it will be better to do after this

[ashishjain0512]

@yari-dewalt Please take the latest, and also, see the comments from @jgreywolf

[yari-dewalt]

@jgreywolf @ashishjain0512
Took latest and no failures, should be good to take a look at