refactor: remove unnecessary reflow trigger in day detail panel

- Eliminated the forced reflow line in the `showAsBottomSheet` function to streamline the rendering process of the day detail panel.
- This change enhances code clarity and maintains the intended functionality without impacting user experience.

webapp/js/dayDetail.js

@@ -186,8 +186,6 @@ function showAsBottomSheet() {
 
   requestAnimationFrame(() => {
     requestAnimationFrame(() => {
-      // Force reflow so WebView paints the "closed" state before we add --open
-      void panelEl.offsetHeight;
       overlayEl.classList.add("day-detail-overlay--visible");
       panelEl.classList.add("day-detail-panel--open");
       const closeBtn = panelEl.querySelector(".day-detail-close");