fix: FIxed compile error

web/components/NetworkBackground.tsx

@@ -43,10 +43,11 @@ export function NetworkBackground() {
     const canvasRef = useRef<HTMLCanvasElement | null>(null);
 
     useEffect(() => {
-        const canvas = canvasRef.current;
+        const canvas: HTMLCanvasElement | null = canvasRef.current;
         if (!canvas) return;
         const ctx = canvas.getContext("2d");
         if (!ctx) return;
+        const cvs: HTMLCanvasElement = canvas;
 
         const reducedMotion = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
 
@@ -138,10 +139,10 @@ export function NetworkBackground() {
             dpr = Math.min(window.devicePixelRatio || 1, 2);
             width = window.innerWidth;
             height = window.innerHeight;
-            canvas.width = Math.floor(width * dpr);
-            canvas.height = Math.floor(height * dpr);
-            canvas.style.width = `${width}px`;
-            canvas.style.height = `${height}px`;
+            cvs.width = Math.floor(width * dpr);
+            cvs.height = Math.floor(height * dpr);
+            cvs.style.width = `${width}px`;
+            cvs.style.height = `${height}px`;
             ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
             build();
         }