feat(技能图标): 改进冷却进度视觉效果和样式

- 移除进度值的clamp限制，允许超出范围效果
- 为冷却进度着色器添加边缘高光和拖尾效果
- 调整图标容器圆角和最小尺寸
- 更新材质参数以支持新的着色器效果

components/Abstracts/SkillIconBase.tscn

@@ -10,18 +10,20 @@ 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
+corner_radius_top_left = 20
+corner_radius_top_right = 20
+corner_radius_bottom_right = 20
+corner_radius_bottom_left = 20
 
 [sub_resource type="ShaderMaterial" id="ShaderMaterial_ew32n"]
 shader = ExtResource("1_jaivk")
 shader_parameter/progress = 0.5
 shader_parameter/backAlpha = 0.25
+shader_parameter/edgeHeight = 0.05
+shader_parameter/trailHeight = 0.3
 
 [node name="SkillIconBase" type="PanelContainer"]
-custom_minimum_size = Vector2(30, 30)
+custom_minimum_size = Vector2(40, 40)
 offset_right = 30.0
 offset_bottom = 30.0
 theme_override_styles/panel = SubResource("StyleBoxFlat_a60wd")