Launch bonus: pay it automatically to the first referral home

Marty offered 5 POL to the first hunter who gets a referral all the way
through. It now pays itself: the bonus is written alongside the very first
bounty anyone earns, from the same faucet, and can never be written twice.

It sits outside the daily referral ceiling on purpose, because it is one
payment rather than a rate, and it announces itself to Telegram so the room
knows the race is over. While it is unclaimed the board card says so, and the
moment it is won the card stops advertising it.

Set refFirstBonusPol to 0 to retire it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

public/app.js

@@ -60,6 +60,7 @@
       + '<p>Send your link. When someone new opens PolHunter and finds their first code, you get <b>' + rf.bountyPol + ' POL</b>. '
       + 'After that you earn <b>' + rf.matchPct + '%</b> on top of everything they find for their first ' + rf.matchDays + ' days. '
       + 'It comes out of our pool, never theirs.</p>'
+      + (rf.firstBonusPol ? '<p class="ref-bonus">\u{1F947} <b>' + rf.firstBonusPol + ' POL bonus, still unclaimed.</b> It goes to the first hunter who brings someone all the way through. Nobody has yet.</p>' : '')
       + '<div class="codebox"><input id="refLink" readonly value="' + esc(link) + '"><button class="btn pol" id="refCopy">Copy</button></div>'
       + '<p style="margin-top:10px"><span class="range">' + today + ' brought today</span> '
       + '<span style="color:var(--dim);font-size:12px">· ' + total + ' all time · ' + rf.earnedPol + ' POL earned</span></p>'