Add services layer, tests, streaming UI, and cleanup legacy code

crawler/frontend/src/index.css

@@ -118,3 +118,30 @@
     @apply bg-background text-foreground;
   }
 }
+
+/* Accordion animations */
+@keyframes accordion-down {
+  from {
+    height: 0;
+  }
+  to {
+    height: var(--radix-accordion-content-height);
+  }
+}
+
+@keyframes accordion-up {
+  from {
+    height: var(--radix-accordion-content-height);
+  }
+  to {
+    height: 0;
+  }
+}
+
+.animate-accordion-down {
+  animation: accordion-down 0.2s ease-out;
+}
+
+.animate-accordion-up {
+  animation: accordion-up 0.2s ease-out;
+}