Adiciona recurso de comparacao de consultores

- Permite selecionar ate 2 consultores na lista via checkbox
- Exibe barra flutuante com consultores selecionados
- Modal de comparacao lado a lado com todos os componentes (A, B, C, D)
- Destaque visual para valores maiores/menores entre os consultores
- Layout responsivo para mobile

frontend/src/App.css

@@ -169,3 +169,112 @@ footer p + p {
   margin-top: 0.5rem;
   font-size: 0.8rem;
 }
+
+.selecao-flutuante {
+  position: fixed;
+  bottom: 2rem;
+  left: 50%;
+  transform: translateX(-50%);
+  background: linear-gradient(155deg, rgba(15, 23, 42, 0.98), rgba(30, 41, 59, 0.95));
+  border: 1px solid var(--accent);
+  border-radius: 16px;
+  padding: 0.85rem 1.25rem;
+  display: flex;
+  align-items: center;
+  gap: 1.5rem;
+  box-shadow: 0 15px 50px rgba(0, 0, 0, 0.5), 0 0 30px rgba(79, 70, 229, 0.2);
+  z-index: 999;
+  backdrop-filter: blur(12px);
+  animation: slideUp 300ms ease;
+}
+
+@keyframes slideUp {
+  from {
+    opacity: 0;
+    transform: translateX(-50%) translateY(20px);
+  }
+  to {
+    opacity: 1;
+    transform: translateX(-50%) translateY(0);
+  }
+}
+
+.selecao-info {
+  display: flex;
+  align-items: center;
+  gap: 0.75rem;
+  color: var(--muted);
+  font-size: 0.9rem;
+}
+
+.selecao-nome {
+  background: rgba(79, 70, 229, 0.2);
+  color: var(--accent-2);
+  padding: 0.3rem 0.6rem;
+  border-radius: 6px;
+  font-size: 0.8rem;
+  font-weight: 600;
+}
+
+.selecao-acoes {
+  display: flex;
+  gap: 0.6rem;
+}
+
+.btn-limpar {
+  padding: 0.55rem 1rem;
+  background: rgba(255, 255, 255, 0.08);
+  border: 1px solid var(--stroke);
+  color: var(--text);
+  border-radius: 8px;
+  cursor: pointer;
+  font-weight: 500;
+  transition: all 150ms ease;
+}
+
+.btn-limpar:hover {
+  background: rgba(255, 59, 48, 0.2);
+  border-color: rgba(255, 59, 48, 0.4);
+}
+
+.btn-comparar {
+  padding: 0.55rem 1.25rem;
+  background: linear-gradient(145deg, var(--accent), var(--accent-2));
+  border: none;
+  color: white;
+  border-radius: 8px;
+  cursor: pointer;
+  font-weight: 600;
+  transition: all 150ms ease;
+}
+
+.btn-comparar:hover:not(:disabled) {
+  filter: brightness(1.1);
+  box-shadow: 0 4px 15px rgba(79, 70, 229, 0.4);
+}
+
+.btn-comparar:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+
+@media (max-width: 600px) {
+  .selecao-flutuante {
+    left: 1rem;
+    right: 1rem;
+    transform: none;
+    flex-direction: column;
+    gap: 0.75rem;
+    padding: 1rem;
+  }
+
+  .selecao-info {
+    flex-wrap: wrap;
+    justify-content: center;
+  }
+
+  .selecao-acoes {
+    width: 100%;
+    justify-content: center;
+  }
+}