feat: add MCP marketplace and custom scrollbar styles

Add comprehensive CSS styles for the MCP Marketplace interface, including card hover effects, responsive grid layout, modal backdrop blur, category badges, rating stars, install buttons, and loading animations. Also include custom scrollbar styling for the model selector to enhance user experience and visual consistency.

components/mcp/MCPRatingStars.tsx

@@ -0,0 +1,74 @@
+"use client";
+
+import { Star } from "lucide-react";
+
+interface MCPRatingStarsProps {
+  rating: number;
+  size?: "sm" | "md" | "lg";
+  showNumber?: boolean;
+}
+
+export function MCPRatingStars({
+  rating,
+  size = "sm",
+  showNumber = true,
+}: MCPRatingStarsProps) {
+  const sizeClasses = {
+    sm: "h-3 w-3",
+    md: "h-4 w-4",
+    lg: "h-5 w-5",
+  };
+
+  const stars = [];
+  const fullStars = Math.floor(rating);
+  const hasHalfStar = rating % 1 >= 0.5;
+
+  // Renderizar estrelas cheias
+  for (let i = 0; i < fullStars; i++) {
+    stars.push(
+      <Star
+        key={i}
+        className={`${sizeClasses[size]} fill-yellow-400 text-yellow-400`}
+      />
+    );
+  }
+
+  // Renderizar meia estrela se necessário
+  if (hasHalfStar) {
+    stars.push(
+      <div key="half" className="relative">
+        <Star className={`${sizeClasses[size]} text-gray-300`} />
+        <div
+          className="absolute inset-0 overflow-hidden"
+          style={{ width: "50%" }}
+        >
+          <Star
+            className={`${sizeClasses[size]} fill-yellow-400 text-yellow-400`}
+          />
+        </div>
+      </div>
+    );
+  }
+
+  // Renderizar estrelas vazias
+  const emptyStars = 5 - Math.ceil(rating);
+  for (let i = 0; i < emptyStars; i++) {
+    stars.push(
+      <Star
+        key={`empty-${i}`}
+        className={`${sizeClasses[size]} text-gray-300`}
+      />
+    );
+  }
+
+  return (
+    <div className="flex items-center gap-1">
+      <div className="flex">{stars}</div>
+      {showNumber && (
+        <span className="text-sm text-[var(--muted-foreground)] ml-1">
+          {rating.toFixed(1)}
+        </span>
+      )}
+    </div>
+  );
+}