feat: polish motion with stronger easing, press feedback and reduced motion (#73)

- Override Tailwind ease-out/ease-in-out with stronger curves, add ease-drawer
- hoverOnlyWhenSupported so hover styles never stick on touch devices
- Replace transition-all with explicit properties across the public UI
- Press feedback via active:scale-[0.97] instead of hover:scale-105
- Global prefers-reduced-motion handling (CSS + MotionConfig reducedMotion="user")
- Mobile menu is a real drawer: stays mounted, inert when closed, Escape closes
- Progress and music bars animate scaleX/scaleY instead of width/height
- Fix undefined animate-spin-slow, contain hero CTA shine with overflow-hidden

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

app/components/ThemeToggle.tsx

@@ -24,7 +24,7 @@ export function ThemeToggle() {
   return (
     <button
       onClick={cycle}
-      className="p-2 rounded-full bg-stone-100 dark:bg-stone-800 text-stone-800 dark:text-stone-100 hover:bg-stone-200 dark:hover:bg-stone-700 border border-stone-200 dark:border-stone-700 shadow-sm hover:scale-105 active:scale-95 transition-all"
+      className="p-2 rounded-full bg-stone-100 dark:bg-stone-800 text-stone-800 dark:text-stone-100 hover:bg-stone-200 dark:hover:bg-stone-700 border border-stone-200 dark:border-stone-700 shadow-sm active:scale-[0.97] transition-[background-color,transform] duration-150 ease-out"
       aria-label={`Current theme: ${theme}. Click to switch.`}
       title={theme === "system" ? "System" : theme === "dark" ? "Dark" : "Light"}
     >