Don't show "Get started" to someone who is signed in.

Boot decides whether a session restores, but plenty renders before it gets
there — the deferred feature chunks land and repaint, an emitter ticks — and
a render that early has no idea whether anyone is signed in. It painted the
welcome screen anyway, so a signed-in wallet flashed the sign-in page for the
~75ms before boot restored it. Waiting for the ark store widened the gap; the
race was already there.

The signed-out screen is now the one screen boot won't guess at: until the
session question is answered, the frame holds the boot shell (the brand row
it's already showing). Every other screen is a deliberate choice — a gift
claim, a locked vault, a chat — and still paints immediately. A release timer
makes sure a boot path that returns early can't hold it back for good.

tools/boot-signin-flash-test.js widens the race and checks every frame of
four reloads; before this it caught the flash on every one.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
Claude-Session: https://claude.ai/code/session_019mrt228Upn9nNCwGixzSLx

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