Merge remote-tracking branch 'upstream/dev' into mwilcox/skip-imported-route-typegen

* upstream/dev: (55 commits)
  Fix root loader data on initial load redirects in SPA mode (#13222)
  Ensure ancestor pathless/index routes are loaded via manifest requests (#13203)
  Fix shoulRevalidate behavior in clientLoader-only routes (#13221)
  Stop leaking internal MiddlewareError implementation detail (#13180)
  Fix validation of split route modules for root route (#13238)
  Fix `RequestHandler` `loadContext` type when middleware is enabled (#13204)
  Change middleware return type from void to undefined (#13199)
  update docs home page
  add API docs
  Fix error message typo
  Fix Windows CI (#13215)
  Remove Vite server hooks in child compiler plugins (#13184)
  Support flexible ordering of Vite plugins that override SSR environment (#13183)
  chore: format
  chore: Update version for release (#13175)
  Exit prerelease mode
  chore: Update version for release (pre) (#13174)
  Fix JSDoc types for context (#13170)
  Remove middleware depth restrictions (#13172)
  minor language improvements in context/middleware decision doc
  ...

Author: wilcoxmd

.changeset/afraid-tigers-promise.md

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+---
+"react-router": patch
+---
+
+- UNSTABLE(BREAKING): If a middleware throws an error, ensure we only bubble the error itself via `next()` and are no longer leaking the `MiddlewareError` implementation detail

.changeset/clever-sheep-draw.md

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+---
+"@react-router/dev": patch
+---
+
+When `future.unstable_splitRouteModules` is set to `"enforce"`, allow both splittable and unsplittable root route exports since it's always in a single chunk.

.changeset/cool-pillows-sing.md

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+---
+"@react-router/dev": patch
+---
+
+When `future.unstable_viteEnvironmentApi` is enabled, allow plugins that override the default SSR environment (such as `@cloudflare/vite-plugin`) to be placed before or after the React Router plugin.

.changeset/cuddly-dots-hear.md

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+---
+"@react-router/dev": patch
+---
+
+Fix conflicts with other Vite plugins that use the `configureServer` and/or `configurePreviewServer` hooks

.changeset/dry-impalas-live.md

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+---
+"react-router": patch
+---
+
+Fix `RequestHandler` `loadContext` parameter type when middleware is enabled

.changeset/dull-hotels-battle.md

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+---
+"react-router": patch
+---
+
+Fix root loader data on initial load redirects in SPA mode