v17.0.0.rc.8

Breaking Changes

• [Pro] Removed the undocumented ReactOnRailsPro::Cache.fetch_react_component class API:
  Pro apps should use the supported cached helper APIs (cached_react_component,
  cached_react_component_hash, and related helpers) instead of calling the low-level cache class
  directly. The helper cache path still preserves generated-pack loading on cache hits, tag
  registration, and expires_at handling internally. Fixes
  Issue 4497.
  PR 4541 by
  justin808.

Fixed

• [Pro] Deferred RSC route failures now reach app error boundaries: Rejected deferred RSC route
  fetches stay observable long enough for React error boundaries to render their fallback, while failed
  entries release their in-flight cache pin without evicting unrelated healthy payloads under concurrent
  load. Fixes Issue 4522.
  PR 4529 by
  justin808.
• [Pro] RSC doctor and version checks resolve Rspack from the configured app dependencies:
  RSC artifact diagnostics and startup version checks now resolve @rspack/core from the configured
  client node_modules path, avoiding false Rspack verification failures when the app's package root
  differs from the current process context. Fixes
  Issue 4523.
  PR 4530 by
  justin808.