Repaint the scene art in the new palette

Workout scenes are warm orange hills under a peach sky, meditation slate
hills with a soft orange sun, must-do sand to charcoal. Goal and group
scenes keep deriving from their colour, with a warmer sky and sun.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KhQh614DMeYoQEH9SoMRUw

frontend/lib/Grounded/utils/Colors.dart

@@ -154,17 +154,21 @@ const Color colorGrabber = Color(0xFFD6D6D6);
 // ── Scene art ─────────────────────────────────────────────────────────────────
 // The painted landscapes that stand in for photography on cards. Each kind has
 // a sky (top → horizon), a sun, three ridges (far → near) and an ember accent.
+// Each: sky top, sky horizon, sun, three hill layers light to dark, detail.
+// Warm orange hills under a peach sky.
 const List<Color> sceneWorkout = <Color>[
-  Color(0xFF9CCBB0), Color(0xFFEFF1DC), Color(0xFFFFD49A),
-  Color(0xFF86B79B), Color(0xFF4E8C6F), Color(0xFF24563F), Color(0xFFE5793D),
+  Color(0xFFF4C9B3), Color(0xFFF8EEE7), Color(0xFFFFB98F),
+  Color(0xFFF0A27C), Color(0xFFDB6A3A), Color(0xFF8A3416), Color(0xFFEC6A36),
 ];
+// Slate hills under a pale grey sky with a soft orange sun.
 const List<Color> sceneMeditation = <Color>[
-  Color(0xFFAEB8E6), Color(0xFFF6E3E2), Color(0xFFFFE6C6),
-  Color(0xFFA2A9D6), Color(0xFF7480B8), Color(0xFF3F4A7A), Color(0xFFF2A6A0),
+  Color(0xFFD5D7DD), Color(0xFFF3F1EF), Color(0xFFF7C2A4),
+  Color(0xFFB7BAC3), Color(0xFF80858F), Color(0xFF363A43), Color(0xFFEC6A36),
 ];
+// Sand to charcoal under the accent sun.
 const List<Color> sceneMustDo = <Color>[
-  Color(0xFFEBCFA3), Color(0xFFF8F0E0), Color(0xFFFFB46B),
-  Color(0xFFD9B37F), Color(0xFFB0834A), Color(0xFF6B4C26), Color(0xFF2F6F4E),
+  Color(0xFFE3DCD4), Color(0xFFF5F2EE), Color(0xFFF2925F),
+  Color(0xFFCDC2B6), Color(0xFF8C8177), Color(0xFF2B2826), Color(0xFF1C1C1C),
 ];
 
 // ── Debt / charting ───────────────────────────────────────────────────────────

frontend/lib/Grounded/utils/CommonUtils.dart

@@ -375,12 +375,12 @@ List<Color> goalScene(Color accent) {
 
   return <Color>[
     shade(0.80, 0.55),
-    const Color(0xFFF6EFE2),
-    const Color(0xFFFFD9A0),
+    const Color(0xFFF5F1EE),
+    const Color(0xFFF7B08C),
     shade(0.66, 0.6),
     shade(0.48, 0.8),
     shade(0.30, 0.9),
-    const Color(0xFFE5793D),
+    colorAccent,
   ];
 }