Fix 4 reported bugs from Phase 4 testing

1. Invite auto-sends at read_only: now stages connection with permission
   selector (Read Only / Create Modify / Full Access) before sending
2. Shared calendars missing from event create dropdown: members with
   create_modify+ permission now see shared calendars in calendar picker
3. Shared calendar category not showing for owner: owner's shared calendars
   now appear under SHARED CALENDARS section with "Owner" badge
4. Event creation not updating calendar: handlePanelClose now invalidates
   calendar-events query to ensure FullCalendar refreshes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/components/calendar/CalendarForm.tsx

@@ -1,4 +1,4 @@
-import { useState, FormEvent } from 'react';
+import { useState, FormEvent, useCallback } from 'react';
 import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
 import { toast } from 'sonner';
 import api, { getErrorMessage } from '@/lib/api';
@@ -15,6 +15,7 @@ import { Input } from '@/components/ui/input';
 import { Label } from '@/components/ui/label';
 import { Button } from '@/components/ui/button';
 import { Switch } from '@/components/ui/switch';
+import { Select } from '@/components/ui/select';
 import { useConnections } from '@/hooks/useConnections';
 import { useSharedCalendars } from '@/hooks/useSharedCalendars';
 import CalendarMemberSearch from './CalendarMemberSearch';
@@ -36,6 +37,8 @@ export default function CalendarForm({ calendar, onClose }: CalendarFormProps) {
   const [color, setColor] = useState(calendar?.color || '#3b82f6');
   const [isShared, setIsShared] = useState(calendar?.is_shared ?? false);
 
+  const [pendingInvite, setPendingInvite] = useState<{ conn: Connection; permission: CalendarPermission } | null>(null);
+
   const { connections } = useConnections();
   const { invite, isInviting, updateMember, removeMember } = useSharedCalendars();
 
@@ -93,14 +96,19 @@ export default function CalendarForm({ calendar, onClose }: CalendarFormProps) {
     mutation.mutate();
   };
 
-  const handleInvite = async (conn: Connection) => {
+  const handleSelectConnection = useCallback((conn: Connection) => {
-    if (!calendar) return;
+    setPendingInvite({ conn, permission: 'read_only' });
+  }, []);
+
+  const handleSendInvite = async () => {
+    if (!calendar || !pendingInvite) return;
     await invite({
       calendarId: calendar.id,
-      connectionId: conn.id,
+      connectionId: pendingInvite.conn.id,
-      permission: 'read_only',
+      permission: pendingInvite.permission,
       canAddOthers: false,
     });
+    setPendingInvite(null);
   };
 
   const handleUpdatePermission = async (memberId: number, permission: CalendarPermission) => {
@@ -179,12 +187,48 @@ export default function CalendarForm({ calendar, onClose }: CalendarFormProps) {
                     </span>
                   </div>
 
+                  {pendingInvite ? (
+                    <div className="rounded-md border border-border bg-card-elevated p-3 space-y-2 animate-fade-in">
+                      <div className="flex items-center justify-between">
+                        <span className="text-sm text-foreground">
+                          {pendingInvite.conn.connected_preferred_name || pendingInvite.conn.connected_umbral_name}
+                        </span>
+                        <button
+                          type="button"
+                          onClick={() => setPendingInvite(null)}
+                          className="text-xs text-muted-foreground hover:text-foreground"
+                        >
+                          Cancel
+                        </button>
+                      </div>
+                      <div className="flex items-center gap-2">
+                        <Select
+                          value={pendingInvite.permission}
+                          onChange={(e) => setPendingInvite((prev) => prev ? { ...prev, permission: e.target.value as CalendarPermission } : null)}
+                          className="text-xs flex-1"
+                        >
+                          <option value="read_only">Read Only</option>
+                          <option value="create_modify">Create / Modify</option>
+                          <option value="full_access">Full Access</option>
+                        </Select>
+                        <Button
+                          type="button"
+                          size="sm"
+                          onClick={handleSendInvite}
+                          disabled={isInviting}
+                        >
+                          {isInviting ? 'Sending...' : 'Send Invite'}
+                        </Button>
+                      </div>
+                    </div>
+                  ) : (
                     <CalendarMemberSearch
                       connections={connections}
                       existingMembers={members}
-                    onSelect={handleInvite}
+                      onSelect={handleSelectConnection}
                       isLoading={isInviting}
                     />
+                  )}
 
                   <CalendarMemberList
                     members={members}

frontend/src/components/calendar/CalendarSidebar.tsx

@@ -106,9 +106,9 @@ export default function CalendarSidebar({ onUseTemplate, onSharedVisibilityChang
         </Button>
       </div>
       <div className="flex-1 overflow-y-auto p-3 space-y-4">
-        {/* Owned calendars list */}
+        {/* Owned calendars list (non-shared only) */}
         <div className="space-y-0.5">
-          {calendars.map((cal) => (
+          {calendars.filter((c) => !c.is_shared).map((cal) => (
             <div
               key={cal.id}
               className="group flex items-center gap-2.5 rounded-md px-2 py-1.5 hover:bg-card-elevated transition-colors duration-150"
@@ -138,12 +138,17 @@ export default function CalendarSidebar({ onUseTemplate, onSharedVisibilityChang
           ))}
         </div>
 
-        {/* Shared calendars section */}
+        {/* Shared calendars section -- owned + member */}
+        {(calendars.some((c) => c.is_shared) || sharedCalendars.length > 0) && (
           <SharedCalendarSection
+            ownedSharedCalendars={calendars.filter((c) => c.is_shared)}
             memberships={sharedCalendars}
             visibleSharedIds={visibleSharedIds}
             onVisibilityChange={handleSharedVisibilityChange}
+            onEditCalendar={handleEdit}
+            onToggleCalendar={handleToggle}
           />
+        )}
 
         {/* Templates section */}
         <div className="space-y-1.5">

frontend/src/components/calendar/EventDetailPanel.tsx

@@ -227,8 +227,13 @@ export default function EventDetailPanel({
   isSharedEvent = false,
 }: EventDetailPanelProps) {
   const queryClient = useQueryClient();
-  const { data: calendars = [] } = useCalendars();
+  const { data: calendars = [], sharedData: sharedMemberships = [] } = useCalendars();
-  const selectableCalendars = calendars.filter((c) => !c.is_system);
+  const selectableCalendars = [
+    ...calendars.filter((c) => !c.is_system),
+    ...sharedMemberships
+      .filter((m) => m.permission === 'create_modify' || m.permission === 'full_access')
+      .map((m) => ({ id: m.calendar_id, name: m.calendar_name, color: m.local_color || m.calendar_color, is_default: false })),
+  ];
   const defaultCalendar = calendars.find((c) => c.is_default);
 
   const { data: locations = [] } = useQuery({

frontend/src/components/calendar/SharedCalendarSection.tsx

@@ -1,7 +1,7 @@
 import { useState } from 'react';
 import { Ghost, Pencil } from 'lucide-react';
 import { Checkbox } from '@/components/ui/checkbox';
-import type { SharedCalendarMembership } from '@/types';
+import type { Calendar, SharedCalendarMembership } from '@/types';
 import SharedCalendarSettings from './SharedCalendarSettings';
 
 const STORAGE_KEY = 'umbra_shared_cal_visibility';
@@ -19,19 +19,25 @@ function saveVisibility(v: Record<number, boolean>) {
 }
 
 interface SharedCalendarSectionProps {
+  ownedSharedCalendars?: Calendar[];
   memberships: SharedCalendarMembership[];
   visibleSharedIds: Set<number>;
   onVisibilityChange: (calendarId: number, visible: boolean) => void;
+  onEditCalendar?: (calendar: Calendar) => void;
+  onToggleCalendar?: (calendar: Calendar) => void;
 }
 
 export default function SharedCalendarSection({
+  ownedSharedCalendars = [],
   memberships,
   visibleSharedIds,
   onVisibilityChange,
+  onEditCalendar,
+  onToggleCalendar,
 }: SharedCalendarSectionProps) {
   const [settingsFor, setSettingsFor] = useState<SharedCalendarMembership | null>(null);
 
-  if (memberships.length === 0) return null;
+  if (memberships.length === 0 && ownedSharedCalendars.length === 0) return null;
 
   return (
     <>
@@ -43,6 +49,36 @@ export default function SharedCalendarSection({
           </span>
         </div>
         <div className="space-y-0.5">
+          {ownedSharedCalendars.map((cal) => (
+            <div
+              key={`owned-${cal.id}`}
+              className="group flex items-center gap-2.5 rounded-md px-2 py-1.5 hover:bg-card-elevated transition-colors duration-150"
+            >
+              <Checkbox
+                checked={cal.is_visible}
+                onChange={() => onToggleCalendar?.(cal)}
+                className="shrink-0"
+                style={{
+                  accentColor: cal.color,
+                  borderColor: cal.is_visible ? cal.color : undefined,
+                  backgroundColor: cal.is_visible ? cal.color : undefined,
+                }}
+              />
+              <span
+                className="h-2.5 w-2.5 rounded-full shrink-0"
+                style={{ backgroundColor: cal.color }}
+              />
+              <span className="text-sm text-foreground truncate flex-1">{cal.name}</span>
+              <span className="text-[10px] text-muted-foreground shrink-0">Owner</span>
+              <button
+                type="button"
+                onClick={() => onEditCalendar?.(cal)}
+                className="opacity-0 group-hover:opacity-100 transition-opacity duration-150 text-muted-foreground hover:text-foreground"
+              >
+                <Pencil className="h-3.5 w-3.5" />
+              </button>
+            </div>
+          ))}
           {memberships.map((m) => {
             const color = m.local_color || m.calendar_color;
             const isVisible = visibleSharedIds.has(m.calendar_id);