Homepage icons: gold on hover like tools page

Icons and labels turn gold on hover, matching the tools page
button styling. Combined with lift effect for visual pop.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontends/web/templates/index.html

@@ -29,12 +29,14 @@
     transition: all 0.15s ease;
 }
 .home-icon:hover i {
+    color: #ffe699;
     transform: translateY(-4px);
     filter: drop-shadow(0 8px 12px rgba(0, 0, 0, 0.5));
 }
 .home-icon:hover span {
     opacity: 1;
     transform: translateY(0);
+    color: #ffe699;
 }
 </style>