feat: 增加NPC范鲸晶

- player场景增加RayCast2D
- 增加npc场景
- 增加NPC对话气泡

scenes/ui/ChatBubble.gd

@@ -0,0 +1,9 @@
+extends Control
+
+@onready var label = $PanelContainer/Label
+
+func set_text(text):
+	label.text = text
+	# Destroy after 5 seconds
+	await get_tree().create_timer(5.0).timeout
+	queue_free()

scenes/ui/ChatBubble.gd.uid

@@ -0,0 +1 @@
+uid://b4aorojcbwkmb

scenes/ui/ChatBubble.tscn

@@ -0,0 +1,42 @@
+[gd_scene load_steps=3 format=3]
+
+[ext_resource type="Script" uid="uid://b4aorojcbwkmb" path="res://scenes/ui/ChatBubble.gd" id="1_script"]
+
+[sub_resource type="StyleBoxFlat" id="StyleBoxFlat_bubble_modern"]
+bg_color = Color(1, 1, 1, 0.9)
+corner_radius_top_left = 5
+corner_radius_top_right = 5
+corner_radius_bottom_right = 5
+corner_radius_bottom_left = 5
+shadow_color = Color(0, 0, 0, 0.2)
+shadow_size = 2
+
+[node name="ChatBubble" type="Control"]
+layout_mode = 3
+anchors_preset = 0
+script = ExtResource("1_script")
+
+[node name="PanelContainer" type="PanelContainer" parent="."]
+layout_mode = 1
+anchors_preset = 7
+anchor_left = 0.5
+anchor_top = 1.0
+anchor_right = 0.5
+anchor_bottom = 1.0
+offset_left = -75.0
+offset_top = -60.0
+offset_right = 75.0
+offset_bottom = -20.0
+grow_horizontal = 2
+grow_vertical = 0
+theme_override_styles/panel = SubResource("StyleBoxFlat_bubble_modern")
+
+[node name="Label" type="Label" parent="PanelContainer"]
+layout_mode = 2
+theme_override_colors/font_color = Color(0.1, 0.1, 0.1, 1)
+theme_override_font_sizes/font_size = 8
+text = "..."
+horizontal_alignment = 1
+vertical_alignment = 1
+autowrap_mode = 3
+custom_minimum_size = Vector2(150, 0)