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ssr: guarded link-claim hole on anchors — the router can render aria-current/data-active (#3878) (#3919)

Element claims never fire during SSR, so plain anchors arrived without
aria-current="page" / data-active. Both compilers now give every candidate
<a href> in SSR output one hole after its attributes, ssrLinkClaim(attrs),
where a render's link handler (setLinkClaim, per render through the owner
chain) writes the anchor's link state and "" otherwise. A static anchor's
hole is an eager call over a hoisted attributes object; a dynamic anchor's
joins the attribute group and reuses the raw value its href hole evaluated.
Anchors the compiler can rule out (static non-empty target, download,
rel~=external, an author's aria-current, an empty or non-HTTP href) get no
hole. ssrElement collects a spread anchor's link attributes from the walk.
The first setLinkClaim of a render writes the `links` hydration record once
(hasServerLinkState() on the client) — the router's signal to trust the
server's link state at hydration instead of resolving every anchor's URL.

Co-authored-by: Claude <noreply@anthropic.com>

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