Remove flash of setup interface on load
Live shows this (see screenshot) for a split second when loading Live. It could be SEO optimization, but it should not be happenning.

Outcome
Live's SEO snapshot is now hidden for JS visitors and shown again via <noscript> for no-JS readers; the viewer goes straight to its spinner. Quick gate and changed-area tests green, visual check done (JS on: hidden, JS off: shown). PR #6728 queued. Memory: none applied.
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