fix(calendar): produce correct JMAP patch when removing recurrence rules

When editing a recurring event and clearing its recurrence, the update
patch was omitting recurrenceRules entirely instead of setting it to null.
The server never received the change. Also clear recurrenceOverrides and
excludedRecurrenceRules so orphaned exceptions don't persist. Same fix
applied to locations and alerts removal.

Fix "this_and_future" scope overriding recurrence removal by reordering
the spread so user updates take precedence over master's original rules.

Closes root-fr/jmap-webmail#14

app/[locale]/calendar/page.tsx

@@ -349,9 +349,9 @@ export default function CalendarPage() {
               freeBusyStatus: master.freeBusyStatus,
               privacy: master.privacy,
               showWithoutTime: master.showWithoutTime,
+              recurrenceRules: originalRules,
               ...updates,
               start: updates.start || occurrenceStart,
-              recurrenceRules: originalRules,
             };
             delete (newEventData as Record<string, unknown>).id;
             delete (newEventData as Record<string, unknown>).uid;

components/calendar/event-modal.tsx

@@ -237,6 +237,8 @@ export function EventModal({
           relativeTo: null,
         },
       };
+    } else if (isEdit && event?.locations && Object.keys(event.locations).length > 0) {
+      data.locations = null;
     }
 
     if (recurrence !== "none") {
@@ -259,6 +261,10 @@ export function EventModal({
         count: null,
         until: null,
       }];
+    } else if (isEdit && event?.recurrenceRules?.length) {
+      data.recurrenceRules = null;
+      if (event.recurrenceOverrides) data.recurrenceOverrides = null;
+      if (event.excludedRecurrenceRules) data.excludedRecurrenceRules = null;
     }
 
     if (alert !== "none") {
@@ -272,6 +278,8 @@ export function EventModal({
           relatedTo: null,
         },
       };
+    } else if (isEdit && event?.alerts && Object.keys(event.alerts).length > 0) {
+      data.alerts = null;
     }
 
     if (attendees.length > 0 && currentUserEmails.length > 0) {