feat(router): loader errors settle into the signal .error channel

[maiieul]

What is it?

• Feature / enhancement

Description

A plain throw new Error in a loader now settles the loader signal's .error instead of failing the response: an .error guard renders it inline, an unguarded .value read throws into the closest <ErrorBoundary>, and the page stays 200. Server-origin errors settle redacted (generic message + digest) at the settle site, so display, state, and the loader.json envelope carry the same redacted error. error()/ServerError and redirects still abort.

Also: an errored async signal keeps its stale value (.value returns it alongside .error, throwing only when nothing ever settled), a resumed errored signal is settled instead of refetching on first read, and loader error envelopes are never HTTP-cached.

[changeset-bot]

🦋 Changeset detected

Latest commit: eb268b2

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@qwik.dev/router	Minor
@qwik.dev/core	Minor
eslint-plugin-qwik	Minor
@qwik.dev/react	Minor
create-qwik	Minor

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commit: eb268b2

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