Docs: Fix tanstack-react snippets

[kylegach]

What I did

See title

Checklist for Contributors

Testing

Manual testing

N/A - docs-only change

Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Checklist for Maintainers

• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli-storybook/src/sandbox-templates.ts

• Make sure this PR contains one of the labels below:

  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
  • build: Internal-facing build tooling & test updates. Will not show up in release changelog.
  • cleanup: Minor cleanup style change. Will not show up in release changelog.
  • documentation: Documentation only changes. Will not show up in release changelog.
  • feature request: Introducing a new feature.
  • BREAKING CHANGE: Changes that break compatibility in some way with current major version.
  • other: Changes that don't fit in the above categories.

Summary by CodeRabbit

Release Notes

• Documentation
  • Updated Storybook TanStack React framework configuration snippets to use the latest integration
  • Clarified CSF Next examples with proper helper functions and imports
  • Removed placeholder comments from documentation
  • Improved preview and configuration example clarity and structure

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

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Run ID: ddcf1fee-39fd-465e-bc2c-e4d854bdf07b

📥 Commits

Reviewing files that changed from the base of the PR and between 7c9e284 and 15768e1.

📒 Files selected for processing (10)

• docs/_snippets/tanstack-react-add-framework.md
• docs/_snippets/tanstack-react-framework-options.md
• docs/_snippets/tanstack-react-mock-module-preview.md
• docs/_snippets/tanstack-react-mock-server-fn-stories.md
• docs/_snippets/tanstack-react-plain-component-story.md
• docs/_snippets/tanstack-react-preview-migrate.md
• docs/_snippets/tanstack-react-query-in-story.md
• docs/_snippets/tanstack-react-query-setup.md
• docs/_snippets/tanstack-react-route-story.md
• docs/_snippets/tanstack-react-route-tree-overrides.md

💤 Files with no reviewable changes (9)

• docs/_snippets/tanstack-react-plain-component-story.md
• docs/_snippets/tanstack-react-mock-server-fn-stories.md
• docs/_snippets/tanstack-react-query-in-story.md
• docs/_snippets/tanstack-react-mock-module-preview.md
• docs/_snippets/tanstack-react-add-framework.md
• docs/_snippets/tanstack-react-preview-migrate.md
• docs/_snippets/tanstack-react-route-tree-overrides.md
• docs/_snippets/tanstack-react-route-story.md
• docs/_snippets/tanstack-react-framework-options.md

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📝 Walkthrough

Walkthrough

Documentation snippets for the Storybook TanStack React integration are updated to clarify framework initialization patterns, add CSF Next examples, improve type safety in configuration code, and remove outdated placeholder comments.

Changes

TanStack React Documentation Snippets

Layer / File(s)	Summary
Framework setup documentation docs/_snippets/tanstack-react-framework-options.md, docs/_snippets/tanstack-react-preview-migrate.md	CSF Next examples with defineMain and definePreview are added to framework options and preview migration snippets; imports updated from @storybook/react-vite to @storybook/tanstack-react.
Query configuration and setup docs/_snippets/tanstack-react-query-setup.md	CSF 3 snippet refactored to import and use the Preview type, define a typed preview constant with beforeEach cache clearing, and export that constant; comments updated to reference story beforeEach instead of route loaders; placeholder comment removed.
Feature usage examples docs/_snippets/tanstack-react-mock-module-preview.md, docs/_snippets/tanstack-react-mock-server-fn-stories.md, docs/_snippets/tanstack-react-plain-component-story.md, docs/_snippets/tanstack-react-query-in-story.md, docs/_snippets/tanstack-react-route-story.md, docs/_snippets/tanstack-react-route-tree-overrides.md	CSF Next examples with definePreview added to mock module preview; outdated HTML comments about needing JS snippets for both CSF 3 and CSF Next removed from all feature example snippets.

Possibly Related PRs

• storybookjs/storybook#34764: Complements this PR's query setup refactor in tanstack-react-query-setup.md by updating the beforeEach-driven queryClient cache handling patterns.
• storybookjs/storybook#34639: Originally introduced the TanStack React documentation snippets referenced in this PR's updates to framework configuration and feature examples.

🎯 2 (Simple) | ⏱️ ~8 minutes

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