fix(calendar): use events.patch instead of events.update to preserve all event fields

The updateEvent method used events.update (PUT), which replaces the entire
event resource. Any field not explicitly included in the request body gets
wiped -- including summary, description, reminders, colorId, visibility,
recurrence, attachments, and conferenceData. Critically, it also rejects
non-default eventTypes (Focus Time, Out of Office, Working Location) with
Event type cannot be changed because omitting eventType is interpreted
as changing it to default.

Switch to events.patch (PATCH), which only modifies the fields present in
the request body and preserves everything else. This is the correct HTTP
semantics for partial updates and matches the methods documented intent
(patch semantics comment was already in the code).

Fixes updating Focus Time, Out of Office, and Working Location events.
Also fixes data loss when updating any event with only a subset of fields
(e.g., changing only the time without re-specifying the title).

Ref: https://developers.google.com/calendar/api/v3/reference/events/patch

Author: rzager-wq

workspace-server/src/services/CalendarService.ts

@@ -724,7 +724,7 @@ export class CalendarService {
     try {
       const calendar = await this.getCalendar();
 
-      // Build request body with only the fields to update (patch semantics)
+      // Build request body with only the fields to update (true patch semantics)
       const requestBody: calendar_v3.Schema$Event = {};
       if (summary !== undefined) requestBody.summary = summary;
       if (description !== undefined) requestBody.description = description;
@@ -733,19 +733,24 @@ export class CalendarService {
       if (attendees)
         requestBody.attendees = attendees.map((email) => ({ email }));
 
-      const updateParams: calendar_v3.Params$Resource$Events$Update = {
+      const patchParams: calendar_v3.Params$Resource$Events$Patch = {
         calendarId: finalCalendarId,
         eventId,
         requestBody,
       };
       this.applyMeetAndAttachments(
         requestBody,
-        updateParams,
+        patchParams as calendar_v3.Params$Resource$Events$Update,
         addGoogleMeet,
         attachments,
       );
 
-      const res = await calendar.events.update(updateParams);
+      // Use events.patch (not events.update) so only specified fields are modified.
+      // events.update (PUT) replaces the entire event, which wipes unspecified fields
+      // like summary, description, reminders, colorId, visibility, and — critically —
+      // rejects non-default eventTypes (Focus Time, Out of Office, Working Location)
+      // with "Event type cannot be changed."
+      const res = await calendar.events.patch(patchParams);
 
       logToFile(`Successfully updated event: ${res.data.id}`);
       return {