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/components/shared-view.tsx

@@ -0,0 +1,79 @@
+import { MapPin, StickyNote } from "lucide-react";
+import type { CalendarShareData, EventShareData } from "../server/share-queries";
+
+function formatEventTime(startAt: string, endAt: string, allDay: boolean): string {
+  const start = new Date(startAt);
+  const end = new Date(endAt);
+  if (allDay) {
+    return start.toLocaleDateString(undefined, { weekday: "short", month: "long", day: "numeric" });
+  }
+  const dateStr = start.toLocaleDateString(undefined, {
+    weekday: "short",
+    month: "long",
+    day: "numeric",
+  });
+  const startTime = start.toLocaleTimeString(undefined, { hour: "numeric", minute: "2-digit" });
+  const endTime = end.toLocaleTimeString(undefined, { hour: "numeric", minute: "2-digit" });
+  return `${dateStr} · ${startTime}–${endTime}`;
+}
+
+export function EventSharedView({ data }: { data: EventShareData }) {
+  return (
+    <div className="mx-auto max-w-xl space-y-4 p-4">
+      <header className="space-y-1">
+        <p className="text-xs font-medium uppercase tracking-wide text-muted-foreground">
+          {data.calendarName}
+        </p>
+        <h1 className="text-2xl font-semibold">{data.title}</h1>
+        <p className="text-sm text-muted-foreground">
+          {formatEventTime(data.startAt, data.endAt, data.allDay)}
+        </p>
+      </header>
+      {data.location && (
+        <div className="flex items-start gap-2 text-sm">
+          <MapPin className="mt-0.5 size-4 shrink-0 text-muted-foreground" />
+          <span>{data.location}</span>
+        </div>
+      )}
+      {data.notes && (
+        <div className="flex items-start gap-2 text-sm">
+          <StickyNote className="mt-0.5 size-4 shrink-0 text-muted-foreground" />
+          <p className="whitespace-pre-wrap">{data.notes}</p>
+        </div>
+      )}
+    </div>
+  );
+}
+
+export function CalendarSharedView({ data }: { data: CalendarShareData }) {
+  return (
+    <div className="mx-auto max-w-xl space-y-4 p-4">
+      <header>
+        <h1 className="text-2xl font-semibold">{data.name}</h1>
+        <p className="text-sm text-muted-foreground">
+          Upcoming events — next 90 days
+        </p>
+      </header>
+      {data.events.length === 0 ? (
+        <p className="text-sm text-muted-foreground">No upcoming events.</p>
+      ) : (
+        <ul className="divide-y rounded-lg border bg-background">
+          {data.events.map((event) => (
+            <li key={event.id} className="flex flex-col gap-0.5 px-4 py-3">
+              <span className="font-medium">{event.title}</span>
+              <span className="text-xs text-muted-foreground">
+                {formatEventTime(event.startAt, event.endAt, event.allDay)}
+              </span>
+              {event.location && (
+                <span className="flex items-center gap-1 text-xs text-muted-foreground">
+                  <MapPin className="size-3" />
+                  {event.location}
+                </span>
+              )}
+            </li>
+          ))}
+        </ul>
+      )}
+    </div>
+  );
+}