feat: make amber the default theme

src/app.rs

@@ -15,7 +15,7 @@ const BAILOUT_SQ: f32 = 1.0e6;
 /// Cap on exported image dimension (px), to stay within GPU texture limits.
 const MAX_EXPORT_DIM: u32 = 8192 * 16;
 /// Palette names; index maps to `palette_id` in the shader.
-const PALETTE_NAMES: &[&str] = &["Rainbow", "Amber", "Ember", "Lime", "Grayscale"];
+const PALETTE_NAMES: &[&str] = &["Amber", "Rainbow", "Ember", "Lime", "Grayscale"];
 
 #[derive(Clone, Copy, PartialEq, Eq)]
 pub enum FractalMode {

src/shaders/mandelbrot.wgsl

@@ -62,9 +62,9 @@ fn palette(id: u32, t: f32) -> vec3<f32> {
     let a = vec3<f32>(0.5, 0.5, 0.5);
     let b = vec3<f32>(0.5, 0.5, 0.5);
     var c = vec3<f32>(1.0, 1.0, 1.0);
-    var d = vec3<f32>(0.00, 0.33, 0.67); // 0: rainbow
+    var d = vec3<f32>(0.00, 0.10, 0.20); // 0: amber / blue
     if (id == 1u) {
-        d = vec3<f32>(0.00, 0.10, 0.20); // amber / blue
+        d = vec3<f32>(0.00, 0.33, 0.67); // rainbow
     } else if (id == 2u) {
         d = vec3<f32>(0.30, 0.20, 0.20); // warm ember
     } else if (id == 3u) {