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

scenes/ui/WorldBulletinPanel.tscn

@@ -0,0 +1,13 @@
+[gd_scene load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://scenes/ui/WorldBulletinPanel.gd" id="1_world_bulletin"]
+
+[node name="WorldBulletinPanel" type="Control"]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+mouse_filter = 2
+script = ExtResource("1_world_bulletin")