ci: run tests on PRs against next

[ryansolid]

test.yml only triggers on push/pull_request for main, so PRs targeting next (the Solid 2 line, where all current work lands) get no unit-suite run in CI — only Check dist types and the Socket checks. The client suite, server suite and test:types are exercised for next only after the fact, by release.yml's test gate on the push.

This adds next to both branch filters so PRs against next run the same pnpm run test as PRs against main, and a direct push to next gets a Tests run alongside the release gate.

Public API changes

None — CI configuration only.

— Claude via Cursor

[changeset-bot]

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Latest commit: cbbf3a4

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[ryansolid]

Closing: the commit on this branch carried a wrong author email (a scripting slip). Reopened with the same change and a correct author as a fresh PR.

— Claude via Cursor