feat: add tanstack support

[michael-han-dev]

Description

Rebased and cleaned up version of #159. Adds Tanstack as a supported framework.

Tanstack uses Vite under the hood, so no new plugin code is needed, works with workflow/vite.

included in changes:

• Workbench example app (workbench/tanstack-start/)
• Getting started docs (docs/content/docs/getting-started/tanstack-start.mdx)
• CI test configuration
• E2E test updates

Changes from #159:

• Rebased onto current main
• Removed unrelated changes that were bundled in (rollup dependency removal, changeset config changes, sveltekit plugin tweak, pnpm-workspace.yaml changes)
• Added packages/core/e2e/utils.ts change for sourcemap handling (same as vite/astro)

How did you test your changes?

• pnpm build passes
• pnpm test passes
• Local build test includes tanstack-start
• Workbench app structure verified (symlinks to shared workflows/plugins)

PR Checklist - Required to merge

• 📦 pnpm changeset was run to create a changelog for this PR
  • During beta, we only use "patch" mode for changes. Don't tag minor/major versions.
  • Use pnpm changeset --empty if you are changing documentation or workbench apps
• 🔒 DCO sign-off passes (run git commit --signoff on your commits)

[changeset-bot]

🦋 Changeset detected

Latest commit: 7b3e14f

The changes in this PR will be included in the next version bump.

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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
	npm/​@​tanstack/​react-router-devtools@​1.157.16
	npm/​@​types/​react-dom@​19.2.3
	npm/​@​tanstack/​react-router-ssr-query@​1.157.16
	npm/​@​tanstack/​router-plugin@​1.157.16
	npm/​@​types/​react@​19.2.3
	npm/​@​types/​node@​22.19.7
	npm/​@​tanstack/​react-start@​1.157.16
	npm/​react@​19.2.3 ⏵ 19.2.4
	npm/​@​testing-library/​dom@​10.4.1
	npm/​@​tanstack/​react-devtools@​0.8.6
	npm/​web-vitals@​5.1.0
	npm/​@​tailwindcss/​vite@​4.1.18
	npm/​@​vitejs/​plugin-react@​5.1.2
	npm/​jsdom@​27.4.0
	npm/​@​testing-library/​react@​16.3.2
	npm/​react-dom@​19.2.3 ⏵ 19.2.4
	npm/​vite-tsconfig-paths@​5.1.4
	npm/​lucide-react@​0.544.0
	npm/​motion@​12.29.0 ⏵ 12.29.2
	npm/​openai@​6.16.0

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