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/buttons/Buttons.dart

@@ -13,10 +13,10 @@ Widget roundedCornerButton(
   Color? foreground,
   IconData? icon,
   bool enabled = true,
-  double radius = 14,
+  double radius = 99,
   double verticalPadding = 16,
 }) {
-  final Color bg = enabled ? (background ?? colorPrimaryDark) : colorGrey;
+  final Color bg = enabled ? (background ?? colorNight) : colorGrey;
   final Color fg = foreground ?? colorWhite;
 
   return ElevatedButton(
@@ -35,10 +35,13 @@ Widget roundedCornerButton(
       mainAxisAlignment: MainAxisAlignment.center,
       children: [
         if (icon != null) ...[
-          Icon(icon, size: 16, color: fg),
+          // The default night pill carries the lime spark on its icon.
+          Icon(icon,
+              size: 16,
+              color: background == null && foreground == null ? colorLime : fg),
           const SizedBox(width: 8),
         ],
-        text(label, 14, TextType.Bold, color: fg),
+        text(label, 14, TextType.Medium, color: fg),
       ],
     ),
   );
@@ -52,7 +55,7 @@ Widget outlinedActionButton(
   Color? foreground,
   IconData? icon,
   bool enabled = true,
-  double radius = 14,
+  double radius = 99,
 }) {
   final Color fg = enabled ? (foreground ?? colorPrimaryDark) : colorGrey;