fix(store): /new painted the handoff card before redirecting

[johanhal]

#25 moved the blank-deck create to the worker. It removed the two megabytes and the progress text, but not the screen — Johan was still seeing it.

What I got wrong

The decision lived at the bottom of the body. So a person reaching /new directly got the whole card parsed and painted first — heading, Deck and Size rows, a Save button, a Close button, and a footer telling them to keep the tab open — none of it addressed to them, on screen for as long as the redirect plus the create took.

From the index it was invisible, because that button goes straight to /new/blank. From a bookmark or a typed URL it was the same screen as before.

I verified #25 by screenshotting after the redirect had completed, which could only ever show the destination. That is the actual mistake here, not the placement.

The fix

The redirect moves to a parser-blocking inline script at the top of the body, before any of that markup exists — the same trick kernel/src/save.ts uses to delete the first-page preview before a browser can paint it.

It is emitted only when the create branch is on, so what the page is willing to do stays readable in the bytes. That is how the retired host's behaviour is checked, and it keeps dead code out of the handoff page.

Verification

Rig 377/377, and it now pins the ordering rather than the presence:

• the redirect appears before <main>
• before id="save", the button belonging to the other audience
• before the "keep this tab open" footer
• and if (window.opener) return still comes first, so the handoff wins

Unchanged: the handoff card itself, the old host's exemptions, NEW_ENABLED.

Worker only — wrangler deploy, no shell release.

🤖 Generated with Claude Code

https://claude.ai/code/session_01KhNJ6no7FeLu15siczqD3C