feat: P1 features — voice speed, private receipts, room filter, favorites, invite link, poll creation

P1-5: Voice message playback speed toggle (0.75×/1×/1.5×/2×) in AudioContent.tsx
P1-10: Private read receipts toggle in Privacy settings; wired to notifications.ts
P1-3: Room filter input on Home tab and DMs tab (client-side, clears on tab switch)
P1-8: Favorite rooms via m.favourite tag — Favorites section in Home sidebar, star/unstar in right-click menu
P1-9: Room invite link + QR code in room settings (Share Room tile, api.qrserver.com QR)
P1-6: Poll creation modal in composer (PollCreator.tsx, sends m.poll.start)

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

src/app/features/common-settings/general/index.ts

@@ -4,4 +4,5 @@ export * from './RoomHistoryVisibility';
 export * from './RoomJoinRules';
 export * from './RoomProfile';
 export * from './RoomPublish';
+export * from './RoomShareInvite';
 export * from './RoomUpgrade';