Fix Roku Dev Studio script typecheck resolution in CI

[Copilot]

The CI failure came from typecheck:scripts traversing renderer-adjacent imports with a scripts tsconfig that no longer matched the renderer graph. This change updates that path so script verification files can typecheck against renderer code without pulling in spurious TS errors.

• Align script typecheck with renderer import requirements

  • update tsconfig.scripts.json to use the same modern target/module-resolution assumptions as the renderer-adjacent code it reaches
  • add the DOM/iterable libs and Node types needed by mixed script + renderer import graphs
  • include renderer ambient declarations so script typecheck sees the same window.roku surface as renderer code

• Make vendored ESM resolvable in standalone script typecheck

  • add a pretypecheck:scripts hook so typecheck:scripts prepares the generated renderer vendor files before TypeScript runs
  • add a declaration-side companion for renderer/vendor/tanstack-virtual-core.mjs so strict script typecheck can type the vendored ESM import directly

• Resulting behavior

  • verification scripts that import renderer modules now typecheck in the same environment assumptions as the modules they depend on, instead of failing on config drift

{
  "scripts": {
    "pretypecheck:scripts": "npm run pretypecheck:renderer",
    "typecheck:scripts": "tsc --noEmit -p tsconfig.scripts.json"
  }
}