feat: 3 neue shader (vibrance, grayscale, invert) auf F7-F9, blaulicht-duplikat entfernt

config/hypr/shaders/grayscale.glsl

@@ -0,0 +1,12 @@
+#version 300 es
+precision highp float;
+
+in vec2 v_texcoord;
+uniform sampler2D tex;
+out vec4 fragColor;
+
+void main() {
+    vec4 pixColor = texture(tex, v_texcoord);
+    float gray = dot(pixColor.rgb, vec3(0.2627, 0.6780, 0.0593));
+    fragColor = vec4(vec3(gray), pixColor.a);
+}