feat(order-book): night-contrast refresh + selective glow on offer cards

lib/core/app_theme.dart

@@ -49,8 +49,10 @@ class AppColors extends ThemeExtension<AppColors> {
   final Color messageSent;
   final Color messageReceived;
   final Color systemMessage;
+
   /// Dark-gold color used for the notification count badge.
   final Color badgeGold;
+
   /// Amber used for time-sensitive warnings (running timers, backup nags).
   final Color warningAmber;
 
@@ -146,7 +148,11 @@ class AppColors extends ThemeExtension<AppColors> {
 // ── Order Book redesign palette ───────────────────────────────────────────────
 
 /// Palette of the "Mostro UX Redesign" mock (Claude Design, screen
-/// #3 · Order book). Applied only to the redesigned Order Book screen while
+/// #3 · Order book), with the night-contrast refresh ("Card Contrast
+/// Options" mock, option 06 combined + 07's selective glow): darker page
+/// background, lighter cards, a 9% hairline on every card, and a green glow
+/// reserved for the one card per screen that is selected / needs action.
+/// Applied only to the redesigned Order Book screen while
 /// the rest of the app migrates screen by screen; dark values follow the mock
 /// except where the mock fails WCAG AA (4.5:1) on its real rendered surface —
 /// [textTertiary] and [red] are lightened just enough to pass. The mock is
@@ -172,6 +178,8 @@ class OrderBookPalette {
     required this.blueFill,
     required this.amber,
     required this.red,
+    required this.glowBorder,
+    required this.glowRing,
   });
 
   final Color bg;
@@ -195,15 +203,24 @@ class OrderBookPalette {
   final Color amber;
   final Color red;
 
+  /// Border of the one selected / action-required card per screen
+  /// (mock: `rgba(143,224,74,0.55)`). Pair with [glowRing]; every other
+  /// card keeps the plain [border] hairline — if all cards glow, none does.
+  final Color glowBorder;
+
+  /// Soft green halo behind the selected card
+  /// (mock: `0 0 0 1px rgba(143,224,74,0.25), 0 0 22px rgba(143,224,74,0.18)`).
+  final List<BoxShadow> glowRing;
+
   static const dark = OrderBookPalette(
-    bg: Color(0xFF0F151C),
-    bgCard: Color(0xFF1A2029),
-    bgElevated: Color(0xFF222A35),
-    border: Color(0x0FFFFFFF), // rgba(255,255,255,0.06)
+    bg: Color(0xFF080B0F),
+    bgCard: Color(0xFF232C38),
+    bgElevated: Color(0xFF2C3644),
+    border: Color(0x17FFFFFF), // rgba(255,255,255,0.09)
     textPrimary: Color(0xFFF2F4F7),
     textSecondary: Color(0xFFA8B0BC),
-    // Mock #6B7280 is 3.4:1 on the card — lightened to pass AA (4.8:1).
-    textTertiary: Color(0xFF848C9A),
+    // Mock #6B7280 is 3.5:1 on the card — lightened to pass AA (4.6:1).
+    textTertiary: Color(0xFF8B93A1),
     tabInactive: Color(0xFF4A5060),
     green: Color(0xFF8FE04A),
     greenDim: Color(0xFF2A4015),
@@ -212,8 +229,19 @@ class OrderBookPalette {
     blue: Color(0xFF7BB4F0),
     blueFill: Color(0xFF1E2B42),
     amber: Color(0xFFE89C3C),
-    // Mock #E5484D is 3.7:1 on its 13% pill fill — lightened to pass AA.
-    red: Color(0xFFF27D81),
+    // Mock #E5484D is 3.8:1 on its 13% pill fill — lightened to pass AA.
+    red: Color(0xFFF48489),
+    glowBorder: Color(0x8C8FE04A), // rgba(143,224,74,0.55)
+    glowRing: [
+      BoxShadow(
+        color: Color(0x408FE04A), // rgba(143,224,74,0.25)
+        spreadRadius: 1,
+      ),
+      BoxShadow(
+        color: Color(0x2E8FE04A), // rgba(143,224,74,0.18)
+        blurRadius: 22,
+      ),
+    ],
   );
 
   static const light = OrderBookPalette(
@@ -233,6 +261,12 @@ class OrderBookPalette {
     blueFill: Color(0x2635638F),
     amber: Color(0xFF845010),
     red: Color(0xFFAE3333),
+    // Same alphas as dark over the light theme's AA-safe green.
+    glowBorder: Color(0x8C426800),
+    glowRing: [
+      BoxShadow(color: Color(0x40426800), spreadRadius: 1),
+      BoxShadow(color: Color(0x2E426800), blurRadius: 22),
+    ],
   );
 
   static OrderBookPalette of(BuildContext context) =>
@@ -325,16 +359,16 @@ const _light = AppColors(
 // ── ThemeData factories ────────────────────────────────────────────────────────
 
 ThemeData buildDarkTheme() => _buildTheme(
-      brightness: Brightness.dark,
-      colors: _dark,
-      scaffold: const Color(0xFF1B1E28),
-    );
+  brightness: Brightness.dark,
+  colors: _dark,
+  scaffold: const Color(0xFF1B1E28),
+);
 
 ThemeData buildLightTheme() => _buildTheme(
-      brightness: Brightness.light,
-      colors: _light,
-      scaffold: const Color(0xFFFFFFFF),
-    );
+  brightness: Brightness.light,
+  colors: _light,
+  scaffold: const Color(0xFFFFFFFF),
+);
 
 ThemeData _buildTheme({
   required Brightness brightness,
@@ -467,6 +501,5 @@ class _NoTransitionBuilder extends PageTransitionsBuilder {
     Animation<double> animation,
     Animation<double> secondaryAnimation,
     Widget child,
-  ) =>
-      child;
+  ) => child;
 }