Redesign the UI after the fitness reference and replace the logo

Light sage-to-cream ambient backdrop, frosted glass controls and painted
SceneArt landscapes in place of photography. Home becomes a dashboard with a
two-tone greeting, a frosted summary ring, category portraits, an up-next rail
of image-led cards and a floating glass tab bar. The routine library gets an
image header and painted cards; the player gets a scene stage, steps on an
arc, a dotted clock and a night pill with a lime spark. Goals become painted
cards in their own colour.

New logo: a lime sun resting on a ground line under two arcs. The splash
raises the sun and lights the arcs; launcher icons and native splash are
regenerated to match.

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

frontend/lib/Grounded/utils/CommonUtils.dart

@@ -352,3 +352,55 @@ String targetLabel(DateTime? target) {
   }
   return "$days day${days == 1 ? "" : "s"} left";
 }
+
+/// The painted landscape a routine kind wears on its cards.
+List<Color> scenePalette(RoutineKind value) {
+  switch (value) {
+    case RoutineKind.Workout:
+      return sceneWorkout;
+    case RoutineKind.Meditation:
+      return sceneMeditation;
+    case RoutineKind.MustDo:
+      return sceneMustDo;
+  }
+}
+
+/// A landscape tinted from a goal's accent, so a goal's cards read as its own.
+List<Color> goalScene(Color accent) {
+  final HSLColor base = HSLColor.fromColor(accent);
+  Color shade(double lightness, double saturation) => base
+      .withLightness(lightness)
+      .withSaturation((base.saturation * saturation).clamp(0.0, 1.0))
+      .toColor();
+
+  return <Color>[
+    shade(0.80, 0.55),
+    const Color(0xFFF6EFE2),
+    const Color(0xFFFFD9A0),
+    shade(0.66, 0.6),
+    shade(0.48, 0.8),
+    shade(0.30, 0.9),
+    const Color(0xFFE5793D),
+  ];
+}
+
+/// The landscape for a task row, chosen by how much the task weighs.
+List<Color> classScene(CommitmentClass value) {
+  switch (value) {
+    case CommitmentClass.NonNegotiable:
+      return sceneMustDo;
+    case CommitmentClass.Standard:
+      return sceneMeditation;
+    case CommitmentClass.Elective:
+      return sceneWorkout;
+  }
+}
+
+/// A stable seed from any string, so the same item always gets the same scene.
+int sceneSeed(String key) {
+  int hash = 7;
+  for (int unit in key.codeUnits) {
+    hash = (hash * 31 + unit) & 0x7fffffff;
+  }
+  return hash;
+}