[slider] Fix interaction edge cases

[atomiks]

Fixes several slider interaction edge cases around disabled thumbs, canceled changes, range clamping, and form/ARIA behavior.

Changes

• Fixed range sliders so thumbs cannot cross a neighbor whose value is 0.
• Ignored disabled thumbs during direct presses, track presses, and drag selection.
• Prevented canceled slider changes from firing onValueCommitted.
• Registered the range input for field/form focus on invalid submits.
• Forwarded aria-valuetext and unhandled keydown events to the range input.
• Updated slider docs examples and regression coverage.

[pkg-pr-new]

• base-ui-tanstack-start

• vite-css-base-ui-example

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/react@4937
  

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/utils@4937
  

commit: 4029530

[code-infra-dashboard]

Bundle size

Bundle	Parsed size	Gzip size
@base-ui/react	🔺+193B(+0.04%)	🔺+54B(+0.04%)

Details of bundle changes

Performance

Total duration: 1,098.49 ms -50.96 ms^(-4.4%) | Renders: 50 ⁽⁺⁰⁾ | Paint: 1,668.70 ms -73.09 ms^(-4.2%)

No significant changes — details

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Check out the code infra dashboard for more information about this PR.

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