fix: strip internal $RCH$ prefix from cancellation reason in ICS files (calcom#25016)

* fix: strip internal RCH prefix from cancellation reason used in ICS

* fixed

* trimmed

Author: kartik-212004

packages/lib/CalEventParser.ts

@@ -223,8 +223,9 @@ export const getPlatformCancelLink = (
   if (calEvent.platformCancelUrl) {
     const platformCancelLink = new URL(`${calEvent.platformCancelUrl}/${bookingUid}`);
     platformCancelLink.searchParams.append("slug", calEvent.type);
-    calEvent.organizer.username &&
+    if (calEvent.organizer.username) {
       platformCancelLink.searchParams.append("username", calEvent.organizer.username);
+    }
     platformCancelLink.searchParams.append("cancel", "true");
     platformCancelLink.searchParams.append("allRemainingBookings", String(!!calEvent.recurringEvent));
     if (seatUid) platformCancelLink.searchParams.append("seatReferenceUid", seatUid);
@@ -267,8 +268,9 @@ export const getPlatformRescheduleLink = (
       `${calEvent.platformRescheduleUrl}/${seatUid ? seatUid : bookingUid}`
     );
     platformRescheduleLink.searchParams.append("slug", calEvent.type);
-    calEvent.organizer.username &&
+    if (calEvent.organizer.username) {
       platformRescheduleLink.searchParams.append("username", calEvent.organizer.username);
+    }
     platformRescheduleLink.searchParams.append("reschedule", "true");
     if (calEvent?.team) platformRescheduleLink.searchParams.append("teamId", calEvent.team.id.toString());
     return platformRescheduleLink.toString();
@@ -408,7 +410,10 @@ export const getRichDescription = (
 
 export const getCancellationReason = (calEvent: Pick<CalendarEvent, "cancellationReason">, t: TFunction) => {
   if (!calEvent.cancellationReason) return "";
-  return `${t("cancellation_reason")}:\n${calEvent.cancellationReason}`;
+  const sanitized = calEvent.cancellationReason.startsWith("$RCH$")
+    ? calEvent.cancellationReason.substring(5).trim()
+    : calEvent.cancellationReason.trim();
+  return `${t("cancellation_reason")}:\n${sanitized}`;
 };
 
 export const isDailyVideoCall = (calEvent: Pick<CalendarEvent, "videoCallData">): boolean => {