fix(ui): restore missing UI transition animations (#408)

- Wrap `Routes` with `AnimatePresence` to enable framer-motion page transition exit animations and fix harsh route changes.
- Replace `tw-animate-css` with `tailwindcss-animate` to properly bundle transition classes (like `animate-in`, `animate-accordion-down`) under Tailwind v4.
- This restores animation to modals, accordions, and all page navigations.
- Fix accessibility warning on table cell span element.

Fixes #283

vite-frontend/src/styles/globals.css

@@ -1,6 +1,6 @@
 @import "tailwindcss";
-@import "tw-animate-css";
 @import "./tailwind-theme.pcss";
+@plugin "tailwindcss-animate";
 
 /* GPU acceleration helper - prevents font blurriness during transforms */
 .gpu-accelerated {