refactor: hoist Slider props and remove dead refs

[adamalston]

No issue.

Hoisted Slider props and remove dead refs.

Changelog

Changed

• Hoisted Slider props.
• Replaced all props.<property> references with direct variables which should improve consistency.

Removed

• Removed dead Slider refs like propsRef and trackRef which became obsolete as the refactor progressed.
• Removed an unnecessary re-read of props in calcDiscreteValueAndPercent.

Testing / Reviewing

Existing tests should cover these changes.

PR Checklist

As the author of this PR, before marking ready for review, confirm you:

• Reviewed every line of the diff
• Updated documentation and storybook examples
• Wrote passing tests that cover this change
• Addressed any impact on accessibility (a11y)
• Tested for cross-browser consistency
• Validated that this code is ready for review and status checks should pass

More details can be found in the pull request guide

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[codecov]

Codecov Report

❌ Patch coverage is 95.65217% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 94.93%. Comparing base (597001a) to head (78d8ec2).
⚠️ Report is 71 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/react/src/components/Slider/Slider.tsx	95.65%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #22001      +/-   ##
==========================================
+ Coverage   94.90%   94.93%   +0.02%     
==========================================
  Files         541      541              
  Lines       45253    45234      -19     
  Branches     6359     6382      +23     
==========================================
- Hits        42949    42941       -8     
+ Misses       2172     2161      -11     
  Partials      132      132              

Flag	Coverage Δ
main-packages	89.15% <95.65%> (-0.02%)	⬇️
web-components	97.70% <ø> (ø)

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[heloiselui]

Looks good to me!