Two issues reported after an Import sign-in:
1. Done button was stuck — user saw the ✓ Signed in screen but the
portal never switched to the names view. Root cause: finishSignIn
fired siriusProfileChanged BEFORE setting window.siriusWallet, so
the portal's listener called adoptWalletFromModal() while
window.siriusWallet was still null, saw no wallet, and did nothing.
Fix: expose the live wallet BEFORE writeProfile so the sync
listener sees it and can enterPortal() immediately.
2. Every reload asked for the password again. Cache the wallet's
mnemonic in sessionStorage on sign-in — same tab (or a page
reload) rebuilds the BuiltInWallet silently via
BuiltInWallet.fromMnemonic; a full browser close clears
sessionStorage and the user is back at the Unlock tab.
sessionStorage is per-origin per-tab so an XSS on Sirius.X pages
would still be able to read it — that's the tradeoff for the
convenience. Chipnet only; mainnet gets the PIN escrow pattern
(3 wrong PIN tries → escalate to password) that Digibyte.x/web
already uses. PIN implementation is deferred to its own commit.
portal.html adoptWalletFromModal now tries sessionStorage after the
in-memory check; register-flow.js startFlow/startTldFlow do the same
via a new async adoptSessionWalletAsync so name and TLD mints on any
page reuse the session wallet with no re-prompt. profile-menu.js
sign-out clears sessionStorage + window.siriusWallet so signing out
really does drop the user.
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