feat: 添加技能图标基础组件和冷却进度着色器

添加紫色水晶技能图标资源
创建冷却进度着色器用于显示技能冷却效果
实现基础技能图标组件，包含样式和着色器效果

components/Abstracts/SkillIconBase.tscn

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+[gd_scene load_steps=5 format=3 uid="uid://ufl4kek8hrmt"]
+
+[ext_resource type="Shader" path="res://shaders/CooldownProgress.gdshader" id="1_jaivk"]
+[ext_resource type="Texture2D" uid="uid://cp4ypuarjoshp" path="res://resources/skillIcons/purple-crystal.png" id="2_hh1bl"]
+
+[sub_resource type="StyleBoxFlat" id="StyleBoxFlat_a60wd"]
+content_margin_left = 5.0
+content_margin_top = 5.0
+content_margin_right = 5.0
+content_margin_bottom = 5.0
+bg_color = Color(0, 0, 0, 0.5)
+corner_radius_top_left = 15
+corner_radius_top_right = 15
+corner_radius_bottom_right = 15
+corner_radius_bottom_left = 15
+
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_ew32n"]
+shader = ExtResource("1_jaivk")
+shader_parameter/progress = 0.58
+
+[node name="SkillIconBase" type="PanelContainer"]
+custom_minimum_size = Vector2(30, 30)
+offset_right = 30.0
+offset_bottom = 30.0
+theme_override_styles/panel = SubResource("StyleBoxFlat_a60wd")
+
+[node name="icon" type="TextureRect" parent="."]
+material = SubResource("ShaderMaterial_ew32n")
+layout_mode = 2
+texture = ExtResource("2_hh1bl")
+expand_mode = 1
+stretch_mode = 5

resources/skillIcons/purple-crystal.png.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://cp4ypuarjoshp"
+path="res://.godot/imported/purple-crystal.png-f9e8d81cb38093f7cc1a3de123d1cd24.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://resources/skillIcons/purple-crystal.png"
+dest_files=["res://.godot/imported/purple-crystal.png-f9e8d81cb38093f7cc1a3de123d1cd24.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

shaders/CooldownProgress.gdshader

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+shader_type canvas_item;
+uniform float progress:hint_range(0.0, 1.0, 0.01)=0.5;
+void fragment() {
+	COLOR=texture(TEXTURE,UV);
+	if(UV.y>=progress){
+		COLOR.a*=0.5;
+	}
+}