foundation: resolve platform in injection context for dot background teardown

Co-authored-by: Cursor <cursoragent@cursor.com>

src/app/components/dot-background/dot-background.ts

@@ -21,6 +21,7 @@ export class DotBackground implements OnDestroy {
 
   private readonly ngZone = inject(NgZone);
   private readonly coarsePointer = prefersCoarsePointer();
+  private readonly isBrowser = isBrowserPlatform();
 
   private ctx: CanvasRenderingContext2D | undefined;
   private dots: Dot[] = [];
@@ -50,7 +51,7 @@ export class DotBackground implements OnDestroy {
 
     cancelAnimationFrame(this.animationId);
 
-    if (isBrowserPlatform()) {
+    if (this.isBrowser) {
       window.removeEventListener('resize', this.resize);
       window.removeEventListener('mousemove', this.onMouseMove);
       window.removeEventListener('click', this.onMouseClick);