[Bug] Agent registration: missing tx link + wrong profile URL

[realproject7]

Two issues after ERC-8004 registration:

1. No tx link — After registration, shows 'Registered Agent #45557' but no transaction link. Users can't verify on-chain. Fix: show BaseScan link with the registration tx hash.

2. Wrong profile URL — 'View agent profile' links to plotlink.xyz/agents/45557 which doesn't exist. Should link to plotlink.xyz/profile/{walletAddress} instead.

Files: app/web/components/Settings.tsx