fix: smooth advanced focus entrance

apps/nextjs/src/components/board/advanced-focus/advanced-focus.module.css

@@ -16,9 +16,15 @@
   box-shadow: var(--mantine-shadow-md);
   overscroll-behavior: contain;
   animation: focus-surface-in 180ms cubic-bezier(0.16, 1, 0.3, 1);
+  animation-fill-mode: backwards;
+  animation-play-state: paused;
   transform-origin: top left;
 }
 
+.surfaceReady {
+  animation-play-state: running;
+}
+
 .manualSurface {
   position: fixed;
   max-width: none;