feat: expand multiplayer, chat, and release support

- add network NPC synchronization and dialogue interactions
- add world bulletin publishing and display
- improve authentication, session refresh, and appearance sync
- synchronize player direction and movement animations
- improve input focus and progressive Web loading
- add macOS/Windows builds and deployment configuration
- include required fonts, shaders, and runtime assets

_Core/EventNames.gd

@@ -19,6 +19,12 @@ const REMOTE_PLAYER_JOINED = "remote_player_joined"
 const REMOTE_PLAYER_LEFT = "remote_player_left"
 const REMOTE_PLAYER_POSITION_UPDATED = "remote_player_position_updated"
 const REMOTE_PLAYERS_SNAPSHOT_READY = "remote_players_snapshot_ready"
+const NPC_SNAPSHOT_READY = "npc_snapshot_ready"
+const NPC_ACTION_STARTED = "npc_action_started"
+const NPC_ACTION_COMPLETED = "npc_action_completed"
+const NPC_SPOKE = "npc_spoke"
+const NPC_INTERACTION_ERROR = "npc_interaction_error"
+const NPC_CONVERSATION = "npc_conversation"
 const REMOTE_SKIN_READY = "remote_skin_ready"
 const REMOTE_SKIN_FAILED = "remote_skin_failed"
 const PLAYER_HEALTH_CHANGED = "player_health_changed"