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fix(web): stop loading useHead stylesheets from halting hydration (#3600)

* fix(web): stop loading useHead stylesheets from halting hydration

The waitAsset gate memo is created without an owner, and the hydrating
createMemo peeked a hydration id from that null owner. The gate is now
transparent, and useHead skips it while hydrating, since that content is
already visible.

A streamed boundary whose swap the server holds on a stylesheet ($dfs)
settled its _fr record before the swap ran. Resuming on the settle
claimed against a document without the content and rendered a second
copy, so the resume now waits for the swap.

* chore(web,size): finish #3600 — useHead hydration carve-out in JSDoc, size caps re-measured over #3606

Rebased over #3605/#3606. `useHead`'s JSDoc names the documented-behavior
carve-out: stylesheet reveal gating is skipped while `sharedConfig.hydrating`
is true (hydration claims DOM the browser already painted; the server gated
that paint), no FOUC introduced.

Size caps re-measured on the rebased head (matches CI byte-for-byte):
hydrating (no stores) 20,919 B (+36 over `next`'s 20,883) -> 20.95 KB;
hydrating + stores 31,155 B (+10 over 31,145) -> 31.2 KB. `next` at
ed60f054a already exceeds two caps — #3606 landed over #3605 unmeasured —
so the observe tier (17,455 B, 0 B from this PR) is bumped to 17.5 KB with
a note attributing it to #3606. `+ createStore` unchanged at 16,949.

Co-authored-by: Claude via Cursor <noreply@cursor.com>

---------

Co-authored-by: Ryan Carniato <ryansolid@gmail.com>
Co-authored-by: Claude via Cursor <noreply@cursor.com>

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