schema-apps: polish CSS micro-interactions

[melvincarvalho]

By Charlie 🤖. One coherent CSS-only improvement: refined hover/focus micro-interactions.

Changes to app.css:

• Card lift on hover: subtle -2px translateY + deeper shadow, smooth 300ms transition
• Row active state: slightly stronger background + micro scale-down (0.995) on click for tactile feel
• Chevron rotation: smoother cubic-bezier easing on details disclosure toggle
• Focus rings: softer 200ms ease transition + added depth shadow on focused inputs for better visibility
• New --shadow-hover custom property for the elevated card state

No HTML or JS touched. All apps remain fully functional (gate passes).