Implement share viewer (task 31)

- Makes actorId nullable in activity_log (migration 0010) with onDelete:
  set null so audit history survives user deletion; adds logShareActivity
  for anonymous mutations
- Adds resolveShareToken return of householdId for downstream validation
- Adds renderSharedView to EntityTypeRegistration; each module implements
  loadForShare (no-session bare queries) and renderSharedView
- Calendar: CalendarSharedView (upcoming 90-day events) and
  EventSharedView (title/time/location/notes)
- Lists: ListSharedView (client component with optimistic toggles via
  toggleShareListItem server action in lists/server/share-actions.ts)
- Notes: NoteSharedView (title + body + updated date)
- /app/s/[token]/page.tsx: resolves token, dispatches to loadForShare +
  renderSharedView, friendly error for invalid/expired tokens, noindex
- Middleware /s/* exemption confirmed present (no change needed)

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

src/modules/calendar/manifest.tsx

@@ -1,6 +1,13 @@
 import type { ModuleManifest, WidgetContext } from "../_core/module";
 import { z } from "zod";
 import { listCalendars, listEvents, searchCalendars, searchEvents } from "./server/queries";
+import {
+  loadCalendarForShare,
+  loadEventForShare,
+  type CalendarShareData,
+  type EventShareData,
+} from "./server/share-queries";
+import { CalendarSharedView, EventSharedView } from "./components/shared-view";
 
 const calendarIdsSchema = z.union([z.literal("all"), z.array(z.string().uuid())]);
 
@@ -101,6 +108,8 @@ const manifest: ModuleManifest = {
       share: { canShare: true, defaultCapabilities: ["read"] },
       search: { search: searchCalendars },
       resolveUrl: (id) => `/calendar?id=${id}`,
+      loadForShare: (id) => loadCalendarForShare(id),
+      renderSharedView: ({ data }) => <CalendarSharedView data={data as CalendarShareData} />,
       renderActivity: (entry) => {
         const name = entry.payload?.name as string | undefined;
         if (entry.action === "create") return `Created calendar${name ? ` "${name}"` : ""}`;
@@ -115,6 +124,8 @@ const manifest: ModuleManifest = {
       reminder: { canRemind: true },
       search: { search: searchEvents },
       resolveUrl: (id) => `/calendar/events/${id}`,
+      loadForShare: (id) => loadEventForShare(id),
+      renderSharedView: ({ data }) => <EventSharedView data={data as EventShareData} />,
       renderActivity: (entry) => {
         const title = entry.payload?.title as string | undefined;
         if (entry.action === "create") return `Created event${title ? ` "${title}"` : ""}`;