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fix(solid): a fragment revealed before its _fr settles hydrates the revealed content (#4074) (#4075)

* fix(solid): a fragment revealed before its _fr settles hydrates the revealed content (#4074)

The still-streaming branch of hydratedCreateLoadingBoundary returned the
fallback even when $df had already swapped the content in, so an async
entry running between the reveal and the _fr settlement hydrated a removed
fallback (Hydration key miss, detached element). Return nothing when the
fragment is revealed; the existing resume adopts the content once _fr
settles.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018fTNh1FgQx2WTF5xoxwML1

* size: re-record the two hydrating caps for #4074

Size-Exception: +30 B minified for the revealed-fragment check
(#4074). Caps set at CI's measurement + 10 B. Accepted by the
maintainer 2026-10-15.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018fTNh1FgQx2WTF5xoxwML1

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

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