Refactor FancyCursor to use mouseover delegation

- Moves expensive DOM checks (`closest`) and class toggling from `mousemove` loop to `mouseover` handler.
- Removes `document.elementFromPoint` fallback to eliminate layout thrashing.
- Updates tests to verify performance improvements.
- Fixes `Hero.test.tsx` missing jsdom environment.

src/components/layout/FancyCursor.test.tsx

@@ -86,26 +86,22 @@ describe('FancyCursor', () => {
         document.body.removeChild(link);
     });
 
-    it('uses fallback elementFromPoint if hoveredElement is null', () => {
+    it('does not call elementFromPoint on mousemove', () => {
         // Reset elementFromPoint mock
         const mockElementFromPoint = vi.fn();
         // @ts-ignore
         document.elementFromPoint = mockElementFromPoint;
 
-        // We need to remount to reset internal state if any.
-        // However, 'hoveredElement' variable was defined INSIDE the component in my edit.
-        // Let's double check that.
-
         render(<FancyCursor />);
 
-        // Trigger mousemove WITHOUT prior mouseover.
-        // This should trigger the fallback.
+        // Trigger mousemove
         fireEvent.mouseMove(window, { clientX: 10, clientY: 10 });
 
         act(() => {
             vi.runAllTimers();
         });
 
-        expect(mockElementFromPoint).toHaveBeenCalledWith(10, 10);
+        // Should NOT be called in the optimized version
+        expect(mockElementFromPoint).not.toHaveBeenCalled();
     });
 });

src/components/layout/FancyCursor.tsx

@@ -19,10 +19,24 @@ export const FancyCursor = memo(() => {
         if (!cursor) return;
 
         let animationFrameId: number;
-        let hoveredElement: Element | null = null;
+
+        const updateCursorState = (el: Element | null) => {
+            const classList = cursor.classList;
+
+            // Coercing to boolean with `!!` is a micro-optimization.
+            const isResize = !!el?.closest('#custom-resize-handle');
+            const isText = !!el?.closest('input[type="text"], input[type="email"], textarea, [contenteditable="true"]');
+            const isLink = !!el?.closest('a, button, [role="button"], input[type="submit"], input[type="button"]');
+
+            // These classes are toggled based on the hovered element.
+            // The actual visual styles are defined in your CSS files.
+            classList.toggle('resize-hover', isResize);
+            classList.toggle('text-hover', isText && !isResize);
+            classList.toggle('link-hover', isLink && !isText && !isResize);
+        };
 
         const handleMouseOver = (e: MouseEvent) => {
-            hoveredElement = e.target as Element;
+            updateCursorState(e.target as Element);
         };
 
         // The mouse move handler is throttled with requestAnimationFrame to ensure
@@ -35,25 +49,6 @@ export const FancyCursor = memo(() => {
                 // This shifts the cursor element by half its own width and height,
                 // which effectively centers it on the pointer without affecting the visuals.
                 cursor.style.transform = `translate3d(${e.clientX}px, ${e.clientY}px, 0) translate(-50%, -50%)`;
-
-                // Use the cached hovered element if available, otherwise fallback to elementFromPoint
-                // This fallback is mostly for the initial state before any mouseover events
-                if (!hoveredElement) {
-                    hoveredElement = document.elementFromPoint(e.clientX, e.clientY);
-                }
-                const el = hoveredElement;
-                const classList = cursor.classList;
-                
-                // Coercing to boolean with `!!` is a micro-optimization.
-                const isResize = !!el?.closest('#custom-resize-handle');
-                const isText = !!el?.closest('input[type="text"], input[type="email"], textarea, [contenteditable="true"]');
-                const isLink = !!el?.closest('a, button, [role="button"], input[type="submit"], input[type="button"]');
-
-                // These classes are toggled based on the hovered element.
-                // The actual visual styles are defined in your CSS files.
-                classList.toggle('resize-hover', isResize);
-                classList.toggle('text-hover', isText && !isResize);
-                classList.toggle('link-hover', isLink && !isText && !isResize);
             });
         };
 

src/components/sections/Hero.test.tsx

@@ -1,3 +1,4 @@
+// @vitest-environment jsdom
 import { render, fireEvent, act, cleanup } from "@testing-library/react";
 import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
 import { Hero } from "./Hero";