[toggle] Fix grouped cancelation and JSDoc

[atomiks]

This is part of the Codex review sweep

Changes

• Stop grouped Toggle handling immediately when onPressedChange cancels the event.
• Add regression coverage for canceled Toggle and ToggleGroup changes, including the parent callback staying quiet when child cancellation vetoes the change.
• Document data-disabled for Toggle and add accessible labels to the ToggleGroup hero demos.

[pkg-pr-new]

• base-ui-tanstack-start

• vite-css-base-ui-example

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/react@4940
  

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/utils@4940
  

commit: 56db58e

[code-infra-dashboard]

Bundle size

Bundle	Parsed size	Gzip size
@base-ui/react	🔺+17B(0.00%)	🔺+2B(0.00%)

Details of bundle changes

Performance

Total duration: 1,363.88 ms +134.14 ms^(+10.9%) | Renders: 50 ⁽⁺⁰⁾ | Paint: 2,050.08 ms +166.74 ms^(+8.9%)

Test	Duration	Renders
Slider mount (300 instances)	225.55 ms 🔺+73.55 ms(+48.4%)	3 (+0)
Checkbox mount (500 instances)	115.74 ms 🔺+55.84 ms(+93.2%)	1 (+0)
Tooltip mount (300 contained roots)	64.64 ms 🔺+12.03 ms(+22.9%)	1 (+0)

9 tests within noise — details

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