fix: show dispatch indicator (✓) for topic-follow events too

Topic events that fire a push notification (milestones like
calendar placement, passed, new text) now show ✓ in the
"Based on your topic follows" section, consistent with the
Recent Alerts section. Also clarifies the section description
to explain which events are pushed vs suppressed.

Authored-By: Jack Levy

frontend/app/notifications/page.tsx

@@ -590,12 +590,13 @@ export default function NotificationsPage() {
                   </h2>
                   <p className="text-xs text-muted-foreground mt-1">
                     Bills matching topics you follow that have had recent activity.
-                    These are delivered as notifications — follow a bill directly to change its alert mode.
+                    Milestone events (passed, signed, new text) are pushed; routine referrals are not.
+                    Follow a bill directly to get all updates.
                   </p>
                 </div>
                 <div className="divide-y divide-border">
                   {topicEvents.map((event: NotificationEvent) => (
-                    <EventRow key={event.id} event={event} showDispatch={false} />
+                    <EventRow key={event.id} event={event} showDispatch />
                   ))}
                 </div>
               </section>