fix(memory-shader): 补齐 UI Stencil 并修复 aspect 计算

Co-authored-by: Cursor <cursoragent@cursor.com>

Assets/Shader/Shader/MemoryTuningSprite.shader

@@ -21,6 +21,13 @@ Shader "AibisDream/MemoryTuningSprite"
         _UVDistortFade ("UV Distort Fade", Range(0,1)) = 0
         _MemoryGrayscale ("Memory Grayscale", Range(0,1)) = 0
         _MemoryContrast ("Memory Contrast", Range(0,3)) = 1
+
+        [HideInInspector] _StencilComp ("Stencil Comparison", Float) = 8
+        [HideInInspector] _Stencil ("Stencil ID", Float) = 0
+        [HideInInspector] _StencilOp ("Stencil Operation", Float) = 0
+        [HideInInspector] _StencilWriteMask ("Stencil Write Mask", Float) = 255
+        [HideInInspector] _StencilReadMask ("Stencil Read Mask", Float) = 255
+        [HideInInspector] _ColorMask ("Color Mask", Float) = 15
     }
 
     SubShader
@@ -37,7 +44,18 @@ Shader "AibisDream/MemoryTuningSprite"
         Cull Off
         Lighting Off
         ZWrite Off
+        ZTest [unity_GUIZTestMode]
         Blend SrcAlpha OneMinusSrcAlpha
+        ColorMask [_ColorMask]
+
+        Stencil
+        {
+            Ref [_Stencil]
+            Comp [_StencilComp]
+            Pass [_StencilOp]
+            ReadMask [_StencilReadMask]
+            WriteMask [_StencilWriteMask]
+        }
 
         Pass
         {
@@ -161,7 +179,7 @@ Shader "AibisDream/MemoryTuningSprite"
 
             half4 ChromaticSample(float2 uv, half4 source, half strength)
             {
-                float aspect = max(0.001, _MainTex_TexelSize.z / _MainTex_TexelSize.w);
+                float aspect = max(0.001, abs(_MainTex_TexelSize.z) / max(1.0, abs(_MainTex_TexelSize.w)));
                 float angle = 0.496 * 6.2831853;
                 float2 dirA = float2(cos(angle) / aspect, sin(angle));
                 float2 dirB = -dirA;