Compress twilight to complete within ~1h of sunset

Inserted two extra palette entries around the sunset transition:
- alt -0.262 (-15deg): already full-night (void), so ~1h after
  sunset the sky is properly dark instead of still 11% into the
  long -5.7deg -> -90deg void ramp
- alt -0.087 (-5deg): dusk anchor (panel) — was at -0.1
- alt  0.087 (+5deg): morning anchor (blood) — was at 0.15

Net effect: +5deg to -15deg transition (≈80 minutes of real time
in summer) now sweeps through golden -> rust -> panel -> void
instead of golden -> rust -> panel -> panel/void.

background.html

@@ -627,9 +627,10 @@ if (useVanta && typeof VANTA !== 'undefined') {
             // Rebuild palette
             window.sunPalettes = [
                 { alt: -Math.PI / 2, sky: hexToInt(ASH.void), cloud: hexToInt(ASH.void), light: hexToInt(ASH.stone), bg: hexToInt(ASH.void), cloudShadow: hexToInt(ASH.void), sun: hexToInt(ASH.stone), sunGlare: hexToInt(ASH.ash), sunLight: hexToInt(ASH.stone), sunVis: 0 },
-                { alt: -0.1, sky: hexToInt(ASH.panel), cloud: hexToInt(ASH.void), light: hexToInt(ASH.stone), bg: hexToInt(ASH.void), cloudShadow: hexToInt(ASH.panel), sun: hexToInt(ASH.stone), sunGlare: hexToInt(ASH.ash), sunLight: hexToInt(ASH.stone), sunVis: 0 },
+                { alt: -0.262, sky: hexToInt(ASH.void), cloud: hexToInt(ASH.void), light: hexToInt(ASH.stone), bg: hexToInt(ASH.void), cloudShadow: hexToInt(ASH.void), sun: hexToInt(ASH.stone), sunGlare: hexToInt(ASH.ash), sunLight: hexToInt(ASH.stone), sunVis: 0 },
+                { alt: -0.087, sky: hexToInt(ASH.panel), cloud: hexToInt(ASH.void), light: hexToInt(ASH.stone), bg: hexToInt(ASH.void), cloudShadow: hexToInt(ASH.panel), sun: hexToInt(ASH.stone), sunGlare: hexToInt(ASH.ash), sunLight: hexToInt(ASH.stone), sunVis: 0 },
                 { alt: 0.0, sky: hexToInt(ASH.rust), cloud: hexToInt(ASH.border), light: hexToInt(ASH.gold), bg: hexToInt(ASH.rust), cloudShadow: hexToInt(ASH.raised), sun: hexToInt(ASH.ember), sunGlare: hexToInt(ASH.gold), sunLight: hexToInt(ASH.ember), sunVis: 0.8 },
-                { alt: 0.15, sky: hexToInt(ASH.blood), cloud: hexToInt(ASH.border), light: hexToInt(ASH.ember), bg: hexToInt(ASH.blood), cloudShadow: hexToInt(ASH.raised), sun: hexToInt(ASH.ember), sunGlare: hexToInt(ASH.ember), sunLight: hexToInt(ASH.ember), sunVis: 0.7 },
+                { alt: 0.087, sky: hexToInt(ASH.blood), cloud: hexToInt(ASH.border), light: hexToInt(ASH.ember), bg: hexToInt(ASH.blood), cloudShadow: hexToInt(ASH.raised), sun: hexToInt(ASH.ember), sunGlare: hexToInt(ASH.ember), sunLight: hexToInt(ASH.ember), sunVis: 0.7 },
                 { alt: 0.4, sky: hexToInt(ASH.steel), cloud: hexToInt(ASH.border), light: hexToInt(ASH.bone), bg: hexToInt(ASH.steel), cloudShadow: hexToInt(ASH.steel), sun: hexToInt(ASH.chalk), sunGlare: hexToInt(ASH.bone), sunLight: hexToInt(ASH.chalk), sunVis: 1 },
                 { alt: Math.PI / 2, sky: hexToInt(ASH.steelLight), cloud: hexToInt(ASH.border), light: hexToInt(ASH.chalk), bg: hexToInt(ASH.steelLight), cloudShadow: hexToInt(ASH.steelLight), sun: hexToInt(ASH.chalk), sunGlare: hexToInt(ASH.bone), sunLight: hexToInt(ASH.chalk), sunVis: 1 }
             ];
@@ -671,11 +672,16 @@ if (useVanta && typeof VANTA !== 'undefined') {
         // altitude in radians: -pi/2 (below) to pi/2 (zenith)
         // Sun position palette (altitude-based) - all colors from current theme
         // altitude in radians: -pi/2 (below) to pi/2 (zenith)
+        // Compressed twilight: dusk and dawn palette entries are now at
+// -5deg / +5deg so the sunset transition completes within roughly
+// an hour of clock time. -15deg is already full-night (void), so
+// the sky is properly dark by ~1h after sunset.
 window.sunPalettes = [
                 { alt: -Math.PI / 2, sky: hexToInt(ASH.void), cloud: hexToInt(ASH.void), light: hexToInt(ASH.stone), bg: hexToInt(ASH.void), cloudShadow: hexToInt(ASH.void), sun: hexToInt(ASH.stone), sunGlare: hexToInt(ASH.ash), sunLight: hexToInt(ASH.stone), sunVis: 0 },
-                { alt: -0.1, sky: hexToInt(ASH.panel), cloud: hexToInt(ASH.void), light: hexToInt(ASH.stone), bg: hexToInt(ASH.void), cloudShadow: hexToInt(ASH.panel), sun: hexToInt(ASH.stone), sunGlare: hexToInt(ASH.ash), sunLight: hexToInt(ASH.stone), sunVis: 0 },
+                { alt: -0.262, sky: hexToInt(ASH.void), cloud: hexToInt(ASH.void), light: hexToInt(ASH.stone), bg: hexToInt(ASH.void), cloudShadow: hexToInt(ASH.void), sun: hexToInt(ASH.stone), sunGlare: hexToInt(ASH.ash), sunLight: hexToInt(ASH.stone), sunVis: 0 },
+                { alt: -0.087, sky: hexToInt(ASH.panel), cloud: hexToInt(ASH.void), light: hexToInt(ASH.stone), bg: hexToInt(ASH.void), cloudShadow: hexToInt(ASH.panel), sun: hexToInt(ASH.stone), sunGlare: hexToInt(ASH.ash), sunLight: hexToInt(ASH.stone), sunVis: 0 },
                 { alt: 0.0, sky: hexToInt(ASH.rust), cloud: hexToInt(ASH.border), light: hexToInt(ASH.gold), bg: hexToInt(ASH.rust), cloudShadow: hexToInt(ASH.raised), sun: hexToInt(ASH.ember), sunGlare: hexToInt(ASH.gold), sunLight: hexToInt(ASH.ember), sunVis: 0.8 },
-                { alt: 0.15, sky: hexToInt(ASH.blood), cloud: hexToInt(ASH.border), light: hexToInt(ASH.ember), bg: hexToInt(ASH.blood), cloudShadow: hexToInt(ASH.raised), sun: hexToInt(ASH.ember), sunGlare: hexToInt(ASH.ember), sunLight: hexToInt(ASH.ember), sunVis: 0.7 },
+                { alt: 0.087, sky: hexToInt(ASH.blood), cloud: hexToInt(ASH.border), light: hexToInt(ASH.ember), bg: hexToInt(ASH.blood), cloudShadow: hexToInt(ASH.raised), sun: hexToInt(ASH.ember), sunGlare: hexToInt(ASH.ember), sunLight: hexToInt(ASH.ember), sunVis: 0.7 },
                 { alt: 0.4, sky: hexToInt(ASH.steel), cloud: hexToInt(ASH.border), light: hexToInt(ASH.bone), bg: hexToInt(ASH.steel), cloudShadow: hexToInt(ASH.steel), sun: hexToInt(ASH.chalk), sunGlare: hexToInt(ASH.bone), sunLight: hexToInt(ASH.chalk), sunVis: 1 },
                 { alt: Math.PI / 2, sky: hexToInt(ASH.steelLight), cloud: hexToInt(ASH.border), light: hexToInt(ASH.chalk), bg: hexToInt(ASH.steelLight), cloudShadow: hexToInt(ASH.steelLight), sun: hexToInt(ASH.chalk), sunGlare: hexToInt(ASH.bone), sunLight: hexToInt(ASH.chalk), sunVis: 1 }
         ];