Closes the loop between the nav's profile dropdown and portal.html:
- Adds a 🆕 New wallet card that calls BuiltInWallet.create() to generate
a fresh BIP-39 phrase in the browser. The phrase is shown once for the
user to write down; sign-in only unlocks after they tick the 'I have
written this down' acknowledgement. Copy button included.
- Sign-in (both New and Import paths) now writes localStorage.siriusProfile
= { address, tokenAddress, signedInAt } so any page on the same origin
can render 'signed in' state. Sign-out clears the key and also resets
the New wallet card so a re-sign-in starts clean.
- Handles ?mode=new|import|wc from the profile dropdown's deep-links:
scrolls the matching card into view and briefly outlines it in acid so
the user knows which one they were sent to.
profile-menu.js:
- Re-renders the dropdown on every open() call rather than caching the
first paint, so a sign-in that happens *after* the script's initial
run (same tab: portal.html; other tabs: storage event) reflects in the
nav without needing a full reload.
- Listens for the storage event (cross-tab) and a custom
'siriusProfileChanged' event (same-tab) — portal.html fires that on
every writeProfile/clearProfile call.
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