[docs] Update radio group examples

[mj12albert]

Some tweaks as radio group accepts a value generic now

• 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/@base-ui/react@4083
  

  pnpm add https://pkg.pr.new/@base-ui/utils@4083
  

commit: 9f70d5e

[mui-bot]

Bundle size report

Bundle	Parsed size	Gzip size
@base-ui/react	0B(0.00%)	0B(0.00%)

Details of bundle changes

---

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

[netlify]

✅ Deploy Preview for base-ui ready!

Name	Link
🔨 Latest commit	37b48cf
🔍 Latest deploy log	https://app.netlify.com/projects/base-ui/deploys/698eeb039049aa00083f197e
😎 Deploy Preview	https://deploy-preview-4083--base-ui.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[netlify]

✅ Deploy Preview for base-ui ready!

Name	Link
🔨 Latest commit	9f70d5e
🔍 Latest deploy log	https://app.netlify.com/projects/base-ui/deploys/698eeb4f120cd00008b70c44
😎 Deploy Preview	https://deploy-preview-4083--base-ui.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[greptile-apps]

Greptile Overview

Greptile Summary

Updated radio group examples to leverage the new generic Value type parameter in the RadioGroup component.

• Updated the RadioGroup wrapper component to accept and forward the generic type parameter
• Added explicit type parameter <'ssd' | 'hdd'> in hero demo for type-safe storage type selection
• Removed unnecessary type cast in TanStack Form demo by relying on proper generic typing, simplifying the onValueChange handler

The changes improve type safety across the documentation examples and demonstrate best practices for using the RadioGroup component with typed values.

Confidence Score: 5/5

• This PR is safe to merge with no issues
• The changes are documentation-only updates that improve type safety by properly utilizing the RadioGroup component's generic type parameter. All changes are consistent, well-structured, and eliminate unnecessary type casts.
• No files require special attention

Important Files Changed

Filename	Overview
docs/src/app/(docs)/react/handbook/forms/demos/components/radio-group.tsx	Added generic Value type parameter to RadioGroup wrapper component to properly support typed values
docs/src/app/(docs)/react/handbook/forms/demos/hero/tailwind/index.tsx	Added explicit type parameter `<'ssd'
docs/src/app/(docs)/react/handbook/forms/demos/tanstack-form/tailwind/index.tsx	Removed unnecessary type cast in onValueChange handler by leveraging RadioGroup's generic typing

_{Last reviewed commit: 9f70d5e}