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/Images.dart

@@ -2,8 +2,8 @@ const String imagePath = "assets/images";
 
 const String iconPath = "assets/icons";
 
-/// The anchor mark, matching the native splash so the handover is invisible.
-const String splashMark = "$iconPath/splash.png";
+/// The mark on a night disc, as the native splash shows it.
+const String splashMark = "$iconPath/splash_orb.png";
 
 const String logoMark = "$iconPath/icon.png";