fix: update to correct NeoBrutalismCSS CDN and class names

- Switch CDN to jsdelivr (matches design spec)
- Use nb-card, nb-card-title, nb-button default, nb-checkbox, nb-navbar-link
- Add Google Fonts import for Lexend Mega
- Style all route links as nb-button default buttons
- Fix navbar to use nb-navbar-brand and nb-navbar-nav
- Update style.css for new NB version compatibility

frontend/static/style.css

@@ -16,42 +16,45 @@ body {
   padding: 0;
 }
 
+/* Override NB navbar to have drop shadow like our design */
 .nb-navbar {
-  background: #fff;
-  border-bottom: 3px solid #000;
-  padding: 0.75rem 1.5rem;
-  display: flex;
-  justify-content: space-between;
-  align-items: center;
   box-shadow: 4px 4px 0 #000;
   margin-bottom: 2rem;
 }
 
-.nb-navbar-start, .nb-navbar-end {
-  display: flex;
-  align-items: center;
-  gap: 0.5rem;
-}
-
+/* List items with subtle dividers */
 .nb-list-item {
   border-bottom: 1px solid rgba(0,0,0,0.1);
+  padding: 0.5rem;
 }
 .nb-list-item:last-child {
   border-bottom: none;
 }
 
+/* Stat tiles */
+.stat-tile {
+  text-align: center;
+  padding: 1rem;
+}
+
+/* Container padding */
+.nb-container {
+  padding: 0 1rem;
+}
+
 @keyframes fadeIn {
   from { opacity: 0; }
   to { opacity: 1; }
 }
 
+/* Responsive */
 @media (max-width: 768px) {
   .nb-navbar {
     flex-direction: column;
     gap: 0.5rem;
     padding: 0.5rem;
   }
-  .nb-navbar-end {
+  .nb-navbar-nav {
     flex-wrap: wrap;
     justify-content: center;
   }