fix(react-form-start): replace deprecated inputValidator with validator

[smorimoto]

Summary

TanStack Start has deprecated createServerFn().inputValidator() in favour of .validator(). Projects using @tanstack/react-form-start were seeing a build-time deprecation warning from the Start compiler.

This PR updates the library, example, and SSR documentation to use the new API, and bumps the @tanstack/react-start peer dependency to ^1.168.27, which includes the validator() method.

Changes

• Replace .inputValidator() with .validator() in createServerValidate.tsx
• Update the TanStack Start example and SSR guide
• Bump @tanstack/react-start to ^1.168.27 in react-form-start and the example
• Refresh pnpm-lock.yaml and add minimumReleaseAgeExclude entries for the updated TanStack packages

Test plan

• Built @tanstack/react-form and @tanstack/react-form-start successfully
• Verify the deprecation warning no longer appears when running the TanStack Start example

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📥 Commits

Reviewing files that changed from the base of the PR and between 6a73479 and 2ea2a9a.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (6)

• docs/framework/react/guides/ssr.md
• examples/react/tanstack-start/package.json
• examples/react/tanstack-start/src/utils/form.tsx
• packages/react-form-start/package.json
• packages/react-form-start/src/createServerValidate.tsx
• pnpm-workspace.yaml

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​tanstack/​react-start@​1.168.27

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