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/designs/ChromeTone.dart

@@ -0,0 +1,19 @@
+import 'package:flutter/widgets.dart';
+
+/// Tells controls placed in a [Sheet]'s chrome whether they sit on the light
+/// ambient backdrop or on a coloured stage, so they pick glass to match.
+class ChromeTone extends InheritedWidget {
+  final bool light;
+
+  const ChromeTone({super.key, required this.light, required super.child});
+
+  static bool isLight(BuildContext context) {
+    return context.dependOnInheritedWidgetOfExactType<ChromeTone>()?.light ??
+        false;
+  }
+
+  @override
+  bool updateShouldNotify(covariant ChromeTone oldWidget) {
+    return oldWidget.light != light;
+  }
+}