[otp field] Support ctrl/cmd keyboard shortcuts

[atomiks]

The OTP field only handled plain arrow, Home/End, and Backspace keyboard paths, so common Ctrl/Cmd shortcuts were ignored. This maps Ctrl/Cmd + ArrowLeft and ArrowRight to the same boundary targets as Home/End and routes Ctrl/Cmd + Backspace through the existing keyboard update path to clear the full code.

Changes

• Add Ctrl/Cmd + ArrowLeft and ArrowRight handling to move to the start or end of the filled OTP.
• Add Ctrl/Cmd + Backspace handling to clear the full OTP value and refocus the first slot.
• Add jsdom and Chromium regression coverage for both Ctrl and Cmd modifiers while simplifying the new modifier test cases.

[pkg-pr-new]

• base-ui-tanstack-start

• vite-css-base-ui-example

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/react@4606
  

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/utils@4606
  

commit: c3f2dcb

[code-infra-dashboard]

Bundle size

Bundle	Parsed size	Gzip size
@base-ui/react	🔺+69B(+0.01%)	🔺+37B(+0.03%)

Details of bundle changes

Performance

Total duration: 1,179.55 ms ▼-43.84 ms^(-3.6%) | Renders: 53 ⁽⁺⁰⁾ | Paint: 1,841.82 ms -26.89 ms^(-1.4%)

Test	Duration	Renders
Menu mount (300 instances)	133.72 ms 🔺+9.36 ms(+7.5%)	2 (+0)
Scroll Area mount (300 instances)	89.57 ms 🔺+4.72 ms(+5.6%)	3 (+0)
Menu open (500 items)	65.90 ms 🔺+2.62 ms(+4.1%)	12 (+0)
Select mount (200 instances)	112.84 ms ▼-26.70 ms(-19.1%)	3 (+0)
Dialog mount (300 instances)	70.59 ms ▼-7.96 ms(-10.1%)	2 (+0)

…and 7 more — details

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