fix(web): fail soft when grid element is absent on event mousedown

packages/web/src/common/utils/grid/grid.util.ts

@@ -155,14 +155,10 @@ export const getBeforeTodayDiff = (
   const diff = yesterdayIndex + futureFactor;
   return diff;
 };
-export const getElemById = (id: string): HTMLDivElement => {
+export const getElemById = (id: string): HTMLDivElement | null => {
   const element = document.getElementById(id);
 
-  if (!(element instanceof HTMLDivElement)) {
-    throw new Error(`Expected #${id} to be an HTMLDivElement.`);
-  }
-
-  return element;
+  return element instanceof HTMLDivElement ? element : null;
 };
 
 export const getRelativePercentages = (todayIndex: number) => {

packages/web/src/views/Week/hooks/grid/useGridEventMouseDown.ts

@@ -94,6 +94,9 @@ export const useGridEventMouseDown = (
     e.stopPropagation();
     targetRef.current = e.currentTarget;
     const element = getElemById(elementId);
+    if (!element) {
+      return;
+    }
     const initialX = e.clientX;
     const initialY = e.clientY;
     mouseMoved.current = false;