[combobox][select] Inherit root disabled state in items

[chuganzy]

This PR fixes Combobox.Item and Select.Item not inheriting the disabled state from their root components.

Related discussion

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

[pkg-pr-new]

• base-ui-tanstack-start

• vite-css-base-ui-example

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/react@5365
  

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/utils@5365
  

commit: ff77813

[code-infra-dashboard]

Bundle size

Bundle	Parsed size	Gzip size
@base-ui/react	🔺+32B(+0.01%)	🔺+21B(+0.01%)

Details of bundle changes

Performance

Total duration: 1,259.84 ms -17.45 ms^(-1.4%) | Renders: 78 ⁽⁺⁰⁾ | Paint: 1,988.53 ms -24.48 ms^(-1.2%)

Test	Duration	Renders
Combobox open — 500 items	45.48 ms +7.17 ms(+18.7%)	4 (+0)

14 tests within noise — details

Metric alarms

Test	Metric	Change
Combobox open — 500 items	bench:paint#combobox-open	🔺 +14.31 ms
Combobox open — 500 items	bench:paint	🔺 +14.31 ms

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