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/lists/manifest.tsx

@@ -1,6 +1,8 @@
 import type { ModuleManifest, WidgetContext } from "../_core/module";
 import { z } from "zod";
 import { listLists, listWidgetItems, searchItems, searchLists } from "./server/queries";
+import { loadListForShare, type ListShareData } from "./server/share-queries";
+import { ListSharedView } from "./components/shared-view";
 
 const listIdsSchema = z.union([z.literal("all"), z.array(z.string().uuid())]);
 
@@ -54,6 +56,14 @@ const manifest: ModuleManifest = {
       share: { canShare: true, defaultCapabilities: ["read", "write"] },
       search: { search: searchLists },
       resolveUrl: (id) => `/lists/${id}`,
+      loadForShare: (id) => loadListForShare(id),
+      renderSharedView: ({ data, capabilities, token }) => (
+        <ListSharedView
+          data={data as ListShareData}
+          canWrite={capabilities.write}
+          token={token}
+        />
+      ),
       renderActivity: (entry) => {
         const name = entry.payload?.name as string | undefined;
         if (entry.action === "create") return `Created list${name ? ` "${name}"` : ""}`;