## Summary
- Adds the generated `@stackframe/tanstack-start` workspace package
registration.
- Adds TanStack Start platform macros/dependencies to the SDK template
and generator.
- Adds TanStack Start cookie/token-store support plus the handler SSR
guard needed by Start.
## Scope
This intentionally excludes Dashboard V2 routes, hooks, components, app
shell logic, and dashboard API type additions. Those stay in the
existing dashboard PR/branch.
## Validation
- `pnpm install --lockfile-only --ignore-scripts`
- `pnpm install --ignore-scripts`
- `pnpm -C packages/template lint
src/components-page/stack-handler-client.tsx src/lib/cookie.ts
src/lib/stack-app/apps/implementations/client-app-impl.ts`
Package typecheck was attempted with `pnpm -C packages/template
typecheck`, but the clean worktree lacks generated package declaration
outputs for workspace dependencies such as `@stackframe/stack-shared`
and `@stackframe/stack-ui`. Per repo instructions, package
builds/codegen are not run by agents.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* TanStack Start integration: published SDK package, example demo app,
dashboard onboarding flow, framework-aware CTAs/docs, and a
TanStack-specific provider for client-only auth routes.
* Improved client/server auth: safer runtime guards and consistent
cookie/token-store behavior across SSR and client.
* **Documentation**
* New Integrations guide and expanded getting-started/setup docs with
TanStack Start examples and env/key guidance.
* **Chores**
* Template, build, tooling, and demo config updates to support the new
platform.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
<!--
Make sure you've read the CONTRIBUTING.md guidelines:
https://github.com/stack-auth/stack-auth/blob/dev/CONTRIBUTING.md
-->
<!-- ELLIPSIS_HIDDEN -->
----
> [!IMPORTANT]
> Add `THIS_LINE_PLATFORM` macro for inline platform-specific comments,
replacing `NEXT_LINE_PLATFORM` across the codebase.
>
> - **Macro Addition**:
> - Introduces `THIS_LINE_PLATFORM` macro to replace
`NEXT_LINE_PLATFORM` for inline platform-specific comments.
> - Applied in `stack-handler.tsx`, `link.tsx`, `cookie.ts`, and 10
other files.
> - **Behavior**:
> - `THIS_LINE_PLATFORM` allows inline comments to specify
platform-specific code inclusion.
> - Ensures platform-specific code clarity and separation.
> - **Documentation**:
> - Updated documentation files to use `THIS_LINE_PLATFORM` for
platform-specific sections.
> - **Scripts**:
> - Updated `processMacros` function in `utils.ts` to handle
`THIS_LINE_PLATFORM`.
> - Adjusted `generate-docs.ts` to process new macro correctly.
>
> <sup>This description was created by </sup>[<img alt="Ellipsis"
src="https://img.shields.io/badge/Ellipsis-blue?color=175173">](https://www.ellipsis.dev?ref=stack-auth%2Fstack-auth&utm_source=github&utm_medium=referral)<sup>
for e3a283aa65. It will automatically
update as commits are pushed.</sup>
<!-- ELLIPSIS_HIDDEN -->
