[playtest]: Steal a Dragon

Fixed: "Can't claim a base / Can't place dragons" Root cause: the base sign lookup was searching the wrong nesting level, so every base stayed labeled "UNCLAIMED BASE" forever — you could never tell which nest was yours, so all your placement attempts fell on other players' (empty) pedestals and got rejected ("Not your nest!"). ✅ Sign now correctly updates to "C4RL5'S NEST" on join (verified live in playtest) ✅ A golden beacon pillar shoots above your base for 12s when you claim it, plus an on-screen message telling you it's yours ✅ Verified end-to-end: bought a dragon with E ($25 charged), carried it, placed it at a pedestal, and income started flowing (+$3/s, cash ticking up) New features & fixes 💰 Sell dragons — a "Sell for $X" prompt now sits on every pedestal with a placed dragon (owner only, half price back) 🐉 Unique names — duplicates become "Gloomfang II", "Gloomfang III", etc. 📛 Carrying banner — "🐉 Carrying Gloomfang — run to YOUR nest!" appears at the bottom while holdi