fix(mobile): steady overlay entrance while the keyboard dismisses

Opening a bottom-sheet overlay usually dismisses the keyboard in the same
moment, so the panel's keyboard-inset bottom anchor was transitioning down
underneath the panel's own rise animation — a jerky, offset entrance. The
anchor now snaps to its final position for the duration of the enter
animation and resumes animating afterwards (so an already-open overlay
still lifts smoothly when the keyboard reopens).

packages/ui/src/components/ui/MobileOverlayPanel.tsx

@@ -43,6 +43,12 @@ export const MobileOverlayPanel: React.FC<MobileOverlayPanelProps> = ({
 }) => {
   const overlayRootRef = React.useRef<HTMLElement | null>(null);
   const [entered, setEntered] = React.useState(false);
+  // True once the enter transition has finished. While entering, the panel's
+  // keyboard-inset bottom anchor must NOT animate: opening an overlay usually
+  // closes the keyboard at the same moment, and a transitioning `bottom` under
+  // the panel's own rise made the entrance jerky / offset. During the enter the
+  // anchor snaps to its final value and only the rise animates.
+  const [enterSettled, setEnterSettled] = React.useState(false);
 
   if (typeof document !== 'undefined' && !overlayRootRef.current) {
     overlayRootRef.current = ensureOverlayRoot();
@@ -52,10 +58,18 @@ export const MobileOverlayPanel: React.FC<MobileOverlayPanelProps> = ({
   React.useEffect(() => {
     if (!open) {
       setEntered(false);
+      setEnterSettled(false);
       return;
     }
     const id = window.setTimeout(() => setEntered(true), ENTER_DELAY_MS);
-    return () => window.clearTimeout(id);
+    const settleId = window.setTimeout(
+      () => setEnterSettled(true),
+      ENTER_DELAY_MS + ENTER_DURATION_MS + 50,
+    );
+    return () => {
+      window.clearTimeout(id);
+      window.clearTimeout(settleId);
+    };
   }, [open]);
 
   React.useEffect(() => {
@@ -86,6 +100,7 @@ export const MobileOverlayPanel: React.FC<MobileOverlayPanelProps> = ({
     <div
       className={cn(
         'oc-keyboard-inset-surface fixed inset-0 z-[60] flex flex-col bg-[rgb(0_0_0_/_0.45)] transition-opacity duration-200 ease-out',
+        !enterSettled && 'oc-keyboard-inset-snap',
         entered ? 'opacity-100' : 'opacity-0',
       )}
       role="dialog"