fix(03): WR-01 preserve existing RRULE on edit instead of resetting to none

apps/pwa/src/api/client.ts

@@ -138,7 +138,10 @@ export interface CreateEventPayload {
   allDay: boolean
   start: string            // 'YYYY-MM-DD' for allDay; ISO 8601 for timed
   end: string              // same format as start
-  recurrence: RecurrencePreset
+  // WR-01: optional. CREATE always sends it; EDIT omits it so the API/worker preserve
+  // the event's existing RRULE (the occurrence contract does not expose recurrence, so
+  // the form cannot echo it back without silently resetting it to 'none').
+  recurrence?: RecurrencePreset
   location?: string
   description?: string
   calendarUrl?: string     // omit to use the member's default writable calendar (D-01)

apps/pwa/src/components/EventForm.tsx

@@ -305,12 +305,19 @@ export function EventForm() {
       endTime,
     )
 
+    // WR-01: on EDIT, omit `recurrence` from the payload. The occurrence/expand contract
+    // does not expose the event's existing recurrence (D-03), so the form cannot know it
+    // and would otherwise send 'none' — silently stripping the RRULE and converting a
+    // recurring series into a single event. Omitting the field signals "unchanged"; the
+    // outbox worker then preserves the stored RRULE (see outboxWorker.ts WR-01). On
+    // CREATE the user explicitly chose a recurrence, so it is always sent.
+    const isEdit = eventFormMode === 'edit' && !!eventFormUid
     const payload: CreateEventPayload = {
       title: title.trim(),
       allDay,
       start: serializedStart,
       end: serializedEnd,
-      recurrence,
+      ...(isEdit ? {} : { recurrence }),
       ...(location.trim() ? { location: location.trim() } : {}),
       ...(description.trim() ? { description: description.trim() } : {}),
       ...(writableCalendars.length > 1 && calendarUrl ? { calendarUrl } : {}),
@@ -702,7 +709,11 @@ export function EventForm() {
           </div>
         )}
 
-        {/* Recurrence picker (D-11: whole-series only) */}
+        {/* Recurrence picker (D-11: whole-series only).
+            WR-01: disabled in edit mode — the occurrence contract does not expose the
+            event's recurrence, so the form cannot show/change it without risking a
+            silent reset. Editing recurrence is deferred until the contract exposes it;
+            the existing RRULE is preserved server-side on edit. */}
         <div style={fieldStyle}>
           <label htmlFor="event-recurrence" style={labelStyle}>
             Repeat
@@ -710,8 +721,14 @@ export function EventForm() {
           <select
             id="event-recurrence"
             value={recurrence}
+            disabled={eventFormMode === 'edit'}
             onChange={(e) => setRecurrence(e.target.value as RecurrencePreset)}
-            style={{ ...inputStyle, padding: '0 var(--space-3)', cursor: 'pointer' }}
+            style={{
+              ...inputStyle,
+              padding: '0 var(--space-3)',
+              cursor: eventFormMode === 'edit' ? 'not-allowed' : 'pointer',
+              opacity: eventFormMode === 'edit' ? 0.6 : 1,
+            }}
           >
             <option value="none">None</option>
             <option value="daily">Daily</option>