- Parse MSG_LIST_STABLED_PETS (SMSG): populate StabledPet list with
petNumber, entry, level, name, displayId, and active status
- Detect stable master via gossip option text/keyword matching and
auto-send MSG_LIST_STABLED_PETS request to open the stable UI
- Refresh list automatically after SMSG_STABLE_RESULT to reflect state
- New packet builders: ListStabledPetsPacket, StablePetPacket, UnstablePetPacket
- New public API: requestStabledPetList(), stablePet(slot), unstablePet(petNumber)
- Stable window UI: shows active/stabled pets with store/retrieve buttons,
slot count, refresh, and close; opens when server sends pet list
- Clear stable state on world logout/disconnect
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