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/BentoChat.tsx

@@ -103,9 +103,9 @@ export default function BentoChat() {
           onChange={(e) => setInputValue(e.target.value)}
           onKeyDown={(e) => e.key === "Enter" && handleSend()}
           placeholder="Ask me..."
-          className="w-full bg-white dark:bg-stone-800 border border-stone-200 dark:border-stone-700 rounded-2xl py-3 pl-4 pr-12 text-sm focus:outline-none focus:ring-2 focus:ring-liquid-purple/30 transition-all shadow-inner dark:text-white"
+          className="w-full bg-white dark:bg-stone-800 border border-stone-200 dark:border-stone-700 rounded-2xl py-3 pl-4 pr-12 text-sm focus:outline-none focus:ring-2 focus:ring-liquid-purple/30 transition-[border-color,box-shadow,background-color] duration-150 ease-out shadow-inner dark:text-white"
         />
-        <button onClick={handleSend} aria-label="Send message" className="absolute right-2 top-1/2 -translate-y-1/2 p-2 text-liquid-purple hover:scale-110 transition-transform">
+        <button onClick={handleSend} aria-label="Send message" className="absolute right-2 top-1/2 -translate-y-1/2 p-2 text-liquid-purple active:scale-[0.97] transition-transform duration-150 ease-out">
           <Send size={18} />
         </button>
       </div>