chore(client): mount search-cache invalidation; reminder toast resolves text locally

Wires useSearchCacheInvalidation (#14) and makes ReminderMonitor derive
the toast body from the local event when the stored reminder carries no
text (#10).

Refs #10
Refs #14

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

src/app/pages/client/ClientNonUIFeatures.tsx

@@ -26,6 +26,7 @@ import { settingsAtom } from '../../state/settings';
 import { allInvitesAtom } from '../../state/room-list/inviteList';
 import { useMatrixClient } from '../../hooks/useMatrixClient';
 import { useHydrateMsgDrafts } from '../../hooks/useHydrateMsgDrafts';
+import { useSearchCacheInvalidation } from '../../utils/searchCacheInvalidation';
 import {
   getDirectRoomPath,
   getHomeRoomPath,
@@ -722,14 +723,23 @@ function ReminderMonitor() {
         if (!firedRef.current.has(key)) {
           firedRef.current.add(key);
           const room = mx.getRoom(r.roomId);
+          const roomName = room?.name ?? 'Unknown Room';
+          // Reminders for E2EE rooms carry no text (account data is server-
+          // readable), so resolve the body from the local timeline at fire time.
+          const localBody = room?.findEventById(r.eventId)?.getContent()?.body;
+          const body =
+            r.message ??
+            (typeof localBody === 'string' && localBody
+              ? localBody.slice(0, 120)
+              : `Reminder for a message in ${roomName}`);
           const hashPath = mDirectsRef.current.has(r.roomId)
             ? getDirectRoomPath(r.roomId, r.eventId)
             : getHomeRoomPath(r.roomId, r.eventId);
           setToast({
             id: `reminder-${key}`,
             displayName: 'Reminder',
-            body: r.message,
-            roomName: room?.name ?? 'Unknown Room',
+            body,
+            roomName,
             roomId: r.roomId,
             hashPath,
           });
@@ -896,10 +906,18 @@ function MsgDraftHydrator(): null {
   return null;
 }
 
+// Gitea #14 — keeps the opt-in persistent search cache from outliving the
+// plaintext it indexed (redactions + leaving/being banned from a room).
+function SearchCacheInvalidationFeature(): null {
+  useSearchCacheInvalidation();
+  return null;
+}
+
 export function ClientNonUIFeatures({ children }: ClientNonUIFeaturesProps) {
   return (
     <>
       <MsgDraftHydrator />
+      <SearchCacheInvalidationFeature />
       <SystemEmojiFeature />
       <PageZoomFeature />
       <FaviconUpdater />