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/prefabs/ui/ChatMessage.gd

@@ -163,6 +163,41 @@ func set_message(from_user: String, content: String, timestamp: float, is_self:
 	# 应用样式
 	_apply_style()
 
+# NPC 会话由外层复古对话框承载，单条内容不再绘制聊天气泡。
+func set_dialogue_mode(enabled: bool) -> void:
+	if not enabled:
+		return
+	_cache_node_refs()
+	size_flags_horizontal = Control.SIZE_EXPAND_FILL
+	custom_minimum_size.y = 0.0
+	if message_row:
+		message_row.alignment = BoxContainer.ALIGNMENT_BEGIN
+		message_row.size_flags_horizontal = Control.SIZE_EXPAND_FILL
+		message_row.add_theme_constant_override("separation", 0)
+	if left_avatar_panel:
+		left_avatar_panel.visible = false
+	if right_avatar_panel:
+		right_avatar_panel.visible = false
+	if bubble_panel:
+		bubble_panel.size_flags_horizontal = Control.SIZE_EXPAND_FILL
+		bubble_panel.custom_minimum_size.x = 0.0
+		bubble_panel.add_theme_stylebox_override("panel", StyleBoxEmpty.new())
+	if text_container:
+		text_container.size_flags_horizontal = Control.SIZE_EXPAND_FILL
+		text_container.add_theme_constant_override("separation", 4)
+	if user_info_container:
+		user_info_container.alignment = BoxContainer.ALIGNMENT_BEGIN
+	if username_label:
+		username_label.add_theme_color_override("font_color", Color(0.08, 0.24, 0.27, 1.0))
+		username_label.add_theme_font_size_override("font_size", 16)
+	if timestamp_label:
+		timestamp_label.visible = false
+	if content_label:
+		content_label.custom_minimum_size.x = 0.0
+		content_label.size_flags_horizontal = Control.SIZE_EXPAND_FILL
+		content_label.add_theme_color_override("default_color", Color(0.12, 0.18, 0.18, 1.0))
+		content_label.add_theme_font_size_override("normal_font_size", 17)
+
 # ============================================================================
 # 内部方法 - 样式处理
 # ============================================================================