refactor(card): 将 Highlight border 独立出来

将原先 card_highlighted.png 替换为仅包含高亮而不包含卡背颜色的素材 card_highlight_border.png，
同时新建 Sprite2D 场景 HighlightSprite 用于显示高亮

objects/card/card.gd

@@ -25,6 +25,7 @@ var is_shaking := false
 func _ready():
 	origin_global_position = global_position
 	last_global_position = global_position
+	$HighlightSprite.visible = false
 
 func _on_mouse_release():
 	#prints(entered_area.name, is_card_entered, entered_area.occupied)
@@ -135,22 +136,22 @@ func shake(is_letter_red: bool, amount: float, duration: float) -> void:
 	if is_letter_red:
 		$Word.set_color(ImageLib.PALETTE["red"])
 	else:
-		$CardBackSprite.animation = "default"
+		$HighlightSprite.visible = false
+
 
 
 
 func _on_mouse_entered():
-	$CardBackSprite.animation = "highlighted"
+	$HighlightSprite.visible = true
 	Input.set_default_cursor_shape(Input.CURSOR_POINTING_HAND)
 
 func _on_mouse_exited():
-	$CardBackSprite.animation = "default"
+	$HighlightSprite.visible = false
 	Input.set_default_cursor_shape(Input.CURSOR_ARROW)
 
 func set_color(value: Color) -> void:
 	$Word.set_color(value)
 
-
 func set_victory(v: bool):
 	if v:
 		$CollisionShape2D.set_deferred("disabled", true)

objects/card/card.tscn

@@ -5,11 +5,9 @@
 [ext_resource type="Texture2D" uid="uid://cfbqh1k0etr6g" path="res://objects/card/card1.png" id="3_o4f0v"]
 [ext_resource type="Texture2D" uid="uid://c8qjbksyn1bqt" path="res://objects/card/card2.png" id="4_c30j1"]
 [ext_resource type="Texture2D" uid="uid://bevrfq1hhyqwe" path="res://objects/card/card3.png" id="5_w81n3"]
-[ext_resource type="Texture2D" uid="uid://cmcc5xrpkrd0f" path="res://objects/card/card_highlighted.png" id="6_po2i6"]
+[ext_resource type="Texture2D" uid="uid://pmapbo480in1" path="res://objects/card/card_highlight_border.png" id="7_kix4t"]
 [ext_resource type="AudioStream" uid="uid://cj4v8ehypq3sk" path="res://objects/card/put_down.wav" id="7_u4ylf"]
 
-[sub_resource type="RectangleShape2D" id="RectangleShape2D_gu6l6"]
-
 [sub_resource type="SpriteFrames" id="SpriteFrames_fo0r0"]
 animations = [{
 "frames": [{
@@ -25,16 +23,10 @@ animations = [{
 "loop": true,
 "name": &"default",
 "speed": 5.0
-}, {
-"frames": [{
-"duration": 1.0,
-"texture": ExtResource("6_po2i6")
-}],
-"loop": true,
-"name": &"highlighted",
-"speed": 5.0
 }]
 
+[sub_resource type="RectangleShape2D" id="RectangleShape2D_gu6l6"]
+
 [node name="Card" type="Area2D"]
 z_index = 50
 script = ExtResource("1_0bviv")
@@ -45,14 +37,17 @@ frame_progress = 0.111549
 text_id = 1
 color = Color(0, 0, 0, 1)
 
-[node name="CollisionShape2D" type="CollisionShape2D" parent="."]
-z_index = 15
-shape = SubResource("RectangleShape2D_gu6l6")
-
 [node name="CardBackSprite" type="AnimatedSprite2D" parent="."]
 sprite_frames = SubResource("SpriteFrames_fo0r0")
 autoplay = "default"
 
+[node name="HighlightSprite" type="Sprite2D" parent="."]
+texture = ExtResource("7_kix4t")
+
+[node name="CollisionShape2D" type="CollisionShape2D" parent="."]
+z_index = 15
+shape = SubResource("RectangleShape2D_gu6l6")
+
 [node name="SFXPutDown" type="AudioStreamPlayer" parent="."]
 stream = ExtResource("7_u4ylf")
 volume_db = 13.117

objects/card/card_highlight_border.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://pmapbo480in1"
+path="res://.godot/imported/card_highlight_border.png-c0b130850c2d1dcdc5af25ea7e1dafdc.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://objects/card/card_highlight_border.png"
+dest_files=["res://.godot/imported/card_highlight_border.png-c0b130850c2d1dcdc5af25ea7e1dafdc.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1