Add wallpaper transition effects, courtesy of @Ly-Sec

- Just copied the shaders from noctalia since they're pretty awesome

Shaders/frag/circled_image.frag

@@ -0,0 +1,30 @@
+#version 450
+
+layout(location = 0) in vec2 qt_TexCoord0;
+layout(location = 0) out vec4 fragColor;
+
+layout(binding = 1) uniform sampler2D source;
+
+layout(std140, binding = 0) uniform buf {
+    mat4 qt_Matrix;
+    float qt_Opacity;
+    float imageOpacity;
+} ubuf;
+
+void main() {
+    // Center coordinates around (0, 0)
+    vec2 uv = qt_TexCoord0 - 0.5;
+    
+    // Calculate distance from center
+    float distance = length(uv);
+    
+    // Create circular mask - anything beyond radius 0.5 is transparent
+    float mask = 1.0 - smoothstep(0.48, 0.52, distance);
+    
+    // Sample the texture
+    vec4 color = texture(source, qt_TexCoord0);
+    
+    // Apply the circular mask and opacity
+    float finalAlpha = color.a * mask * ubuf.imageOpacity * ubuf.qt_Opacity;
+    fragColor = vec4(color.rgb * finalAlpha, finalAlpha);
+}