feat(mui): make PageEnter entrance clearly perceptible (16px rise, 0.45s, 0.06s stagger)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/admin/ui/PageEnter.tsx

@@ -7,15 +7,15 @@ const MotionBox = motion(Box);
 
 const container: Variants = {
   hidden: {},
-  show: { transition: { staggerChildren: 0.05, delayChildren: 0.03 } },
+  show: { transition: { staggerChildren: 0.06, delayChildren: 0.04 } },
 };
 
 const itemVariant: Variants = {
-  hidden: { opacity: 0, y: 12 },
+  hidden: { opacity: 0, y: 16 },
   show: {
     opacity: 1,
     y: 0,
-    transition: { duration: 0.4, ease: [0.16, 1, 0.3, 1] },
+    transition: { duration: 0.45, ease: [0.16, 1, 0.3, 1] },
   },
 };