fix: set var encoding button icon to minus when selected

[dannda]

Description

set var encoding button icon to minus when selected

fixes #194

Type of change

• 🐛 Bug fix (non-breaking change that resolves an issue)
• ✨ New feature (non-breaking change that adds functionality)
• ⚡ Optimisation (non-breaking improvement to performance or efficiency)
• 🧩 Documentation (adds or improves documentation)
• 🧱 Maintenance (refactor, dependency update, CI/CD, etc.)
• 🔥 Breaking change (fix or feature that causes existing functionality to change)

Checklist

• All tests pass (eg. npm test)
• Pre-commit hooks run successfully (eg. pre-commit run --all-files)
• Documentation updated (if required)

[Copilot]

Pull Request Overview

This PR enhances the UI feedback for color encoding selection by dynamically changing the icon based on the active state. When a variable or set is active in multiple selection mode, a minus icon is shown; otherwise, a plus icon is displayed.

• Added dynamic icon switching between faMinus and faPlus based on the isActive state
• Updated both VarSet.jsx and VarItem.jsx components to provide consistent visual feedback

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/lib/components/var-list/VarSet.jsx	Added faMinus import and conditional icon rendering for SelectionSet component
src/lib/components/var-list/VarItem.jsx	Added faMinus import and conditional icon rendering for SelectionItem component

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 10.00000% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 15.57%. Comparing base (5135761) to head (bf6ed5b).
⚠️ Report is 2 commits behind head on dev.

Files with missing lines	Patch %	Lines
src/lib/components/var-list/VarSet.jsx	0.00%	5 Missing ⚠️
src/lib/components/var-list/VarItem.jsx	20.00%	1 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #196      +/-   ##
==========================================
- Coverage   15.58%   15.57%   -0.01%     
==========================================
  Files          62       62              
  Lines        2092     2099       +7     
  Branches      504      511       +7     
==========================================
+ Hits          326      327       +1     
- Misses       1706     1711       +5     
- Partials       60       61       +1     

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[davehorsfall]

I've a little more work to update the icons and title depending on the mode (single or multi select).

[davehorsfall]

🎉 This PR is included in version 1.4.5 🎉

The release is available on GitHub release

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