Five UX fixes from a review pass:
1. profile-menu.js: dropdown links (New/Add/WC wallet, Admin) were
absolute /sirius-x/portal.html paths. That's fine on silentmode.st
but under the BCNR route (sirius.x/) the origin is different, so
the gateway forwarded to Sia which returned 'NoSuchKey' XML. Now
derive the base URL from the nav's own .portal anchor href — which
is already set per page with the right relative path — so it works
from the root, from subdirs, and under any BCNR gateway. Admin URL
is derived from the same base.
2. Landing hero got a search input. Submitting it normalises the
label ([a-z0-9-], 63 chars) and redirects to register.html?q=<label>.
register.html now honours ?q= on load: prefills the input, triggers
the parallel multi-TLD lookup, and scrolls into view. Single source
of truth stays in register.html; the landing just hands it a query.
3. Portal TLD-mint error path now special-cases 'wallet is empty' and
shows a friendlier message with the wallet's address and links to
two chipnet faucets, so the fix is one click away instead of a
guess.
4. Removed 'Pantheon' from every page's top nav — it's a section on
the landing that anyone scrolling will discover, and keeping it in
the nav crowded the bar.
5. Cache-buster ?v=20260907rel on the profile-menu.js script include
across all 7 pages so browsers that cached the pre-fix version
pick up the new one on next load.
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