Improve collaboration chart readability and layout

[ggondela1419]

Description

For this PR, I reviewed the CollaborationChart.jsx file and made some updates to improve readability, especially in home mode where multiple metrics overlap. I adjusted the opacity levels and added stroke outlines so the different layers are easier to distinguish from each other. I also moved and adjusted the legend so it fits better within the chart and doesn’t crowd the visualization. For team mode, I reviewed the configuration and confirmed that the axes correctly map to the expected data keys. These changes help reduce visual clutter and make the chart easier to read.

Fixes #230

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

I tested the chart in home mode by running the app locally and viewing the dashboard. I checked that the overlapping shapes are clearly visible and not blending together, and that the legend is positioned correctly within the chart. I also hovered over the chart to test the tooltip and confirmed that it displays the correct values clearly and follows the cursor as expected. For team mode, I temporarily switched the chart to use mode="team" and made sure that it renders correctly when I included the expected data structure.

• Test A: Verified readability and layout in home mode
• Test B: Verified tooltip functionality and team mode rendering

Test Configuration:

• Language Version: JavaScript (React)
• Webpage (if applicable): Home page

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my 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

Screenshot of Output