Nucleic: lavender/purple accent (light + dark shades)

Switch the standard brand accent from deep teal to lavender/purple across
macOS and iOS, with a distinct shade per appearance:

- macOS (AppTheme standard palette): accent -> (0.45, 0.32, 0.82). ~5.4:1
  with white labels in light; nightSoftened() derives the muted dark shade.
- iOS (Palette.accent): now an appearance-aware UIColor — deep violet in
  light, brighter lavender (0.66, 0.55, 0.95) in dark so it lifts off the
  near-black background.
- iOS AccentColor.colorset: add a dark luminosity variant to match.

Accessibility color-vision palettes (deuteranopia/protanopia/tritanopia)
are intentionally left tuned for distinguishability; tritanopia already
renders violet.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

NucleicRemote/NucleicRemote/Assets.xcassets/AccentColor.colorset/Contents.json

@@ -1,4 +1,14 @@
 {
-  "colors" : [ { "color" : { "color-space" : "srgb", "components" : { "red" : "0.118", "green" : "0.565", "blue" : "0.553", "alpha" : "1.000" } }, "idiom" : "universal" } ],
+  "colors" : [
+    {
+      "color" : { "color-space" : "srgb", "components" : { "red" : "0.450", "green" : "0.320", "blue" : "0.820", "alpha" : "1.000" } },
+      "idiom" : "universal"
+    },
+    {
+      "appearances" : [ { "appearance" : "luminosity", "value" : "dark" } ],
+      "color" : { "color-space" : "srgb", "components" : { "red" : "0.660", "green" : "0.550", "blue" : "0.950", "alpha" : "1.000" } },
+      "idiom" : "universal"
+    }
+  ],
   "info" : { "author" : "xcode", "version" : 1 }
 }

NucleicRemote/NucleicRemote/Views/Theme.swift

@@ -1,12 +1,21 @@
 import SwiftUI
+import UIKit
 import NucleicProtocol
 
-/// The mobile mirror of the Mac's design language (AppTheme/AppPalette on desktop): a deep
+/// The mobile mirror of the Mac's design language (AppTheme/AppPalette on desktop): a
-/// teal accent, the same categorical status palette, and the same status→color mapping
+/// lavender/purple accent, the same categorical status palette, and the same status→color
-/// refined by turn disposition — so the two devices read identically. Pure SwiftUI Color
+/// mapping refined by turn disposition — so the two devices read identically. Pure SwiftUI
-/// (no AppKit), adapting to light/dark via the system.
+/// Color, adapting to light/dark via the system.
 enum Palette {
-    static let accent = Color(red: 0.04, green: 0.52, blue: 0.50)   // deep teal
+    /// Lavender/purple accent with a separate shade per appearance: a deep violet in light
+    /// (white labels read at ~5.4:1) and a brighter lavender in dark, so it lifts off the
+    /// near-black background instead of muddying into it. Mirrors the Mac's appearance-aware
+    /// accent (AppPalette, nightSoftened for dark).
+    static let accent = Color(uiColor: UIColor { trait in
+        trait.userInterfaceStyle == .dark
+            ? UIColor(red: 0.66, green: 0.55, blue: 0.95, alpha: 1)   // brighter lavender — dark mode
+            : UIColor(red: 0.45, green: 0.32, blue: 0.82, alpha: 1)   // deep violet — light mode
+    })
     static let active = Color(red: 0.20, green: 0.55, blue: 0.95)   // blue
     static let attention = Color(red: 1.00, green: 0.65, blue: 0.15) // amber
     static let success = Color(red: 0.30, green: 0.80, blue: 0.45)  // green
@@ -111,6 +120,6 @@ struct CardBackground: ViewModifier {
 
 extension View {
     func card(padding: CGFloat = 14) -> some View { modifier(CardBackground(padding: padding)) }
-    /// Apply the teal accent app-wide.
+    /// Apply the lavender accent app-wide.
     func nucleicTint() -> some View { tint(Palette.accent) }
 }