App icon and a lavender Stretching palette

A lotus inside a dry-brush ensō, with a small plate in the gap and a small
barbell as the lifting hint. Drawn by tools/icon/make_icon.py and wired up
with flutter_launcher_icons; the launch screen uses the icon's lavender.
Stretching Mode moves from sage/teal to the icon's lavender and violet.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

lib/src/design/zen_style.dart

@@ -74,16 +74,17 @@ class ZenStyle extends ThemeExtension<ZenStyle> {
   static const stretching = ZenStyle(
     mode: Mode.stretching,
     brightness: Brightness.light,
-    background: Color(0xFFEDF3EF),
+    // Lavender mist and a muted violet, as in the app icon.
+    background: Color(0xFFF1EEF6),
     surface: Color(0xFFFFFFFF),
-    surfaceSoft: Color(0xFFDCEAE2),
-    ink: Color(0xFF1E3832),
-    inkMuted: Color(0xFF587069),
-    accent: Color(0xFF2E8B80),
-    accentEnd: Color(0xFF2E8B80),
+    surfaceSoft: Color(0xFFE4DEEF),
+    ink: Color(0xFF2A2338),
+    inkMuted: Color(0xFF6A6279),
+    accent: Color(0xFF6B5B95),
+    accentEnd: Color(0xFF6B5B95),
     onAccent: Color(0xFFFFFFFF),
-    line: Color(0xFFA8C9B4),
-    navBar: Color(0xFFD3E5DA),
+    line: Color(0xFFC3B8DA),
+    navBar: Color(0xFFE0D9EC),
     radius: 28,
     controlRadius: 999,
     motion: Duration(milliseconds: 700),