Adds the external-wallet variant of registerTldWithBuiltInWallet so
WizardConnect users can mint TLDs from the sirius.x portal without
first importing a seed. Same transaction shape (TREG payload, TLD-
beacon output, service-fee output) — the wallet approves the mint
(and, if needed, a one-time prep signature to satisfy the vout-0
non-token genesis-input rule) on the user's own device.
Bundle: re-exported from src/web/register-entry.js and rebuilt
(bns-register.js: 33.3 kB, cache-buster bumped to ?v=20260907tldext
on portal.html / register.html / admin/index.html).
Portal: TLD-register submit now dispatches on wallet.source, calling
registerTldWithExternalWallet with wallet.session when the user is
signed in via WC. Removed the WC-disable guard and updated the card
copy to say TLD mints also go through the wallet's signing prompt.
Uses the same landOnChain helper as registerWithExternalWallet, so
wallet-broadcasts (walletBroadcasts:true sessions) and duplicate/
mempool responses are handled identically.
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