fix(Dialog): fix broken animation with header tags (#2465)

Author: roberthovsepyan

src/hooks/private/useAnimateHeight/useAnimateHeight.ts

@@ -66,6 +66,11 @@ export function useAnimateHeight({
                 return;
             }
 
+            // Skip animation if height hasn't changed (avoids heading margin collapsing issues)
+            if (previousHeight.current && contentHeight === previousHeight.current) {
+                return;
+            }
+
             // Avoid "ResizeObserver loop completed with undelivered notifications" error
             resizeInfo.observer?.unobserve(node);
 
@@ -109,8 +114,8 @@ function calculateNodeHeight(node: HTMLElement) {
         return node.clientHeight;
     }
 
-    const paddingTop = parseFloat(computedStyle.getPropertyValue('padding-top'));
-    const paddingBottom = parseFloat(computedStyle.getPropertyValue('padding-bottom'));
+    const paddingTop = parseInt(computedStyle.getPropertyValue('padding-top'), 10);
+    const paddingBottom = parseInt(computedStyle.getPropertyValue('padding-bottom'), 10);
 
     return node.clientHeight - paddingTop - paddingBottom;
 }