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/components/ConsultorCard.css

@@ -35,13 +35,76 @@
 .card-main {
   position: relative;
   display: grid;
-  grid-template-columns: 70px 1fr auto;
+  grid-template-columns: 32px 70px 1fr auto;
   align-items: center;
   gap: 1.35rem;
   padding: 1.25rem 1.6rem;
   z-index: 1;
 }
 
+.selecao-checkbox {
+  position: relative;
+  width: 24px;
+  height: 24px;
+  cursor: pointer;
+}
+
+.selecao-checkbox input {
+  position: absolute;
+  opacity: 0;
+  cursor: pointer;
+  height: 0;
+  width: 0;
+}
+
+.selecao-checkbox .checkmark {
+  position: absolute;
+  top: 0;
+  left: 0;
+  height: 24px;
+  width: 24px;
+  background: rgba(255, 255, 255, 0.06);
+  border: 2px solid var(--stroke);
+  border-radius: 6px;
+  transition: all 200ms ease;
+}
+
+.selecao-checkbox:hover .checkmark {
+  border-color: var(--accent);
+  background: rgba(79, 70, 229, 0.1);
+}
+
+.selecao-checkbox input:checked ~ .checkmark {
+  background: linear-gradient(145deg, var(--accent), var(--accent-2));
+  border-color: var(--accent);
+}
+
+.selecao-checkbox .checkmark::after {
+  content: '';
+  position: absolute;
+  display: none;
+  left: 7px;
+  top: 3px;
+  width: 6px;
+  height: 12px;
+  border: solid white;
+  border-width: 0 2px 2px 0;
+  transform: rotate(45deg);
+}
+
+.selecao-checkbox input:checked ~ .checkmark::after {
+  display: block;
+}
+
+.ranking-card.selecionado {
+  border-color: rgba(79, 70, 229, 0.6);
+  box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.3), 0 15px 35px rgba(0, 0, 0, 0.4);
+}
+
+.ranking-card.selecionado::before {
+  background: radial-gradient(circle at -20% 50%, rgba(79, 70, 229, 0.3), transparent 40%);
+}
+
 .rank {
   width: 62px;
   height: 62px;
@@ -366,7 +429,7 @@
 
 @media (max-width: 900px) {
   .card-main {
-    grid-template-columns: 56px 1fr;
+    grid-template-columns: 28px 56px 1fr;
     align-items: flex-start;
   }
 
@@ -380,6 +443,23 @@
   .details-grid {
     grid-template-columns: repeat(2, 1fr);
   }
+
+  .selecao-checkbox {
+    width: 20px;
+    height: 20px;
+  }
+
+  .selecao-checkbox .checkmark {
+    width: 20px;
+    height: 20px;
+  }
+
+  .selecao-checkbox .checkmark::after {
+    left: 6px;
+    top: 2px;
+    width: 5px;
+    height: 10px;
+  }
 }
 
 @media (max-width: 640px) {