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Steve Faulkner 61554eaf37 fix: install react-server-dom-webpack during init and deploy for App Router (#31)
* fix: install react-server-dom-webpack during init and deploy for App Router

vinext init was missing react-server-dom-webpack from its dependency list,
causing 'Could not resolve react-server-dom-webpack/server.edge' errors on
fresh create-next-app projects. Additionally, react-server-dom-webpack@19.2.4
requires react@^19.2.4, but create-next-app ships react@19.2.3 -- the version
mismatch caused npm to nest rsdw inside vinext/node_modules where Vite can't
resolve it.

Fix: add react-server-dom-webpack to getInitDeps for App Router, detect when
the installed React version is too old, and upgrade react/react-dom as regular
dependencies before installing dev deps (avoiding ERESOLVE peer-dep conflicts
and keeping react in 'dependencies' rather than 'devDependencies').

Also applies the same fix to vinext deploy for parity, and adds a CI job that
scaffolds a real create-next-app project, runs vinext init, and verifies the
dev server returns HTTP 200.

Closes #22

* refactor: use createRequire for package resolution instead of direct node_modules reads

Address review feedback (PR #18 pattern): replace fs.existsSync(node_modules/...)
with createRequire-based resolution, which handles hoisting, pnpm symlinks,
monorepos, and Yarn PnP correctly.

- deploy.ts: extract isPackageResolvable() helper using createRequire, use it
  in getMissingDeps for react-server-dom-webpack detection
- init.ts: refactor getReactUpgradeDeps() to use createRequire + findPackageVersion
  walk-up pattern instead of reading node_modules/react/package.json directly
- tests: add isPackageResolvable unit tests, use dependency injection for
  getMissingDeps rsdw test (Vitest's createRequire intercepts resolution)

* ci: add Windows to create-next-app smoke test

Run the create-next-app compatibility test on both ubuntu-latest and
windows-latest. Replace bash-specific server health check (curl, kill,
backgrounding) with a cross-platform Node script using child_process
and http. Use runner.temp instead of /tmp for portable paths.

* fix: use pathToFileURL for dynamic import() calls on Windows

On Windows, Node's ESM loader requires file:// URLs for absolute paths.
Bare paths like D:\... are rejected with ERR_UNSUPPORTED_ESM_URL_SCHEME.

Wrap all dynamic import() calls that receive absolute paths from
require.resolve() or path.join() with pathToFileURL().href:

- index.ts: RSC plugin import, RSC transforms import, PostCSS config
  loading, PostCSS plugin resolution (5 call sites)
- cli.ts: Vite module import from project root

* fix: pathToFileURL for cache-runtime codegen and test imports

Additional Windows fixes found via PR #43 review:

- index.ts: use pathToFileURL for runtimeModulePath in 'use cache'
  transform code generation (2 locations) — these embed absolute paths
  into generated import() statements via JSON.stringify
- pages-router.test.ts: wrap 9 import(serverEntryPath) calls with
  pathToFileURL so tests work on Windows
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