[material][Rating] Fix keyboard navigation behavior in Safari

[harsher216]

• I have followed (at least) the PR section of the contributing guide.

Summary

This PR improves the keyboard accessibility and navigation behavior of the Rating component. It primarily focuses on inconsistent/incorrect behavior in Safari. This is because the Safari browser handles focus, radio navigation, and keyboard events differently from other browsers. As a result, keyboard users experienced (BUG):

• The Rating component being skipped entirely during Tab navigation.
• Arrow keys not starting navigation from the correct star.
• Navigation jumping by 2 steps instead of 1.
• Inconsistent behavior between empty and non-empty rating states.
• Difficulty resetting to the “no rating” value using the keyboard.

This PR makes the Rating component fully keyboard-accessible and consistent across all major browsers.

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Fix implemented

This PR introduces several improvements that together standardize keyboard behavior:

Cross-browser key handling

• Added aliases for Safari’s legacy "Left", "Right", "Up", "Down" event keys.
• Normalized navigation logic through a nextValueForKey helper.
• Included precision-aware movement and full wrap-around (like max → empty → 1).

Reliable, predictable focus behavior (roving tabIndex)

• Only one radio input is tabbable at any time.
  • If value == null, the “empty” radio has tabIndex=0.
  • Otherwise, the currently selected star has tabIndex=0.
  • All other radios use a tabIndex=-1.
• Ensures Safari can correctly enter the component via the tab key.

Single-step arrow key navigation

• Added a guard using event.defaultPrevented inside handleKeyDown so that:
  • the first handler processes the event,
  • any subsequent handlers skip it,
  • preventing double-handling and 2-step jumps.

Consistent behavior across states

• Empty, hovered, focused, and selected states now behave identically in Safari and Chrome.
• Wrap-around works from any state.
• Clearing the value and navigating upwards/downwards works as well.

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Tests

• pnpm test:unit -- Rating passes locally.

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Related issue

Fixes #34202

[mui-bot]

Netlify deploy preview

https://deploy-preview-47461--material-ui.netlify.app/

Bundle size report

Bundle	Parsed size	Gzip size
@mui/material	🔺+1.16KB(+0.22%)	🔺+421B(+0.28%)
@mui/lab	0B(0.00%)	0B(0.00%)
@mui/system	0B(0.00%)	0B(0.00%)
@mui/utils	0B(0.00%)	0B(0.00%)

Details of bundle changes

Generated by 🚫 dangerJS against 25a5e80

[vmaineng]

This update creates a predictable keyboard flow. The normalization of Safari’s legacy keys and the single handler guard remove the double-step issue nicely. The roving tabIndex logic is also spot-on and aligns well with WAI-ARIA radio patterns. Great job on this!