fix(solid-query): commit the idle read of a disabled query on the server

[lazerg]

🎯 Changes

A useQuery with enabled: false and nothing cached stops an SSR render from ever finishing: no bytes are emitted at all.

In computeData, the pending-idle path for a disabled query returns NEVER, a promise that never settles. That is the right client behavior — the reader parks in the nearest <Loading> until an enabling change, a refetch or a cache write revives it. The server has no later: the render has to finish, and nothing will enable the query or write the cache before it does.

So the server now commits the idle read instead, which is the settled SSR truth for a disabled query and the same contract the meta channel already honors for one. Resolving with undefined was rejected for the v5 line in #8345 because it does not match the shape queryFn returns, and that objection stands on the client, where suspending costs nothing and the query may still start. On the server the alternative is not suspension but a page that never responds, so the type docblock now carries the exception. The client path is untouched.

The hydration fixture grows a disabled query in a boundary of its own, so the regression test covers both sides: the server emits the idle face, and the hydrating client adopts it without fetching. Without the fix the fixture's SSR entry never settles and the whole suite fails.

Fixes #11348

✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested this code locally with pnpm run test:pr.

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is docs/CI/dev-only (no release).

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