fix: add legend toggle on click for controlled subplots

[dv-usama-ansari]

Closes N/A

Developer Checklist (Definition of Done)

Issue

• All acceptance criteria from the issue are met
• Tested in latest Chrome/Firefox

UI/UX/Vis

• Requires UI/UX/Vis review
  • Reviewer(s) are notified @thinkh
  • Review has occurred (link to notes)
  • Feedback is included in this PR
  • Reviewer(s) approve of concept and design

Code

• Branch is up-to-date with the branch to be merged with, i.e., develop
• Code is cleaned up and formatted
• Unit tests are written (frontend/backend if applicable)
• Integration tests are written (if applicable)

PR

• Descriptive title for this pull request is provided (will be used for release notes later)
• Reviewer and assignees are defined
• Add type label (e.g., bug, feature) to this pull request
• Add release label (e.g., release: minor) to this PR following semver
• The PR is connected to the corresponding issue (via Closes #...)
• Summary of changes is written

Summary of changes

• Added legend click behavior for controlled subplots

Screenshots

2025-03-28.12-05-36.mp4

Additional notes for the reviewer(s)

• Shall I add the legend click to faceted and scatter plot matrix as well?
• This implementation might not be as straight forward

[thinkh]

@dv-usama-ansari Thanks for the update.

Shall I add the legend click to faceted and scatter plot matrix as well?

Yes, please do so because the customer actually uses the facets mode.

[dv-usama-ansari]

With show all hide all buttons

2025-03-28.13-02-20.mp4

[thinkh]

Thanks for the additional filter option. It works as expected for the facet mode.

scatterplot-filter-legend.webm

However, it does not work for the matrix mode.

I'd expect to see only the gray unknown points in this screenshot.

[thinkh]

I'll merge this because it works for the facet mode and that's what we need for the demo. Please fix the scatter plot matrix in the follow-up issue #771. Thanks.