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/room-nav/RoomNavItem.tsx

@@ -212,6 +212,17 @@ const RoomNavItemMenu = forwardRef<HTMLDivElement, RoomNavItemMenuProps>(
     const [invitePrompt, setInvitePrompt] = useState(false);
     const isServerNotice = room.getType() === 'm.server_notice';
 
+    const isFavorite = !!room.tags?.['m.favourite'];
+
+    const handleToggleFavorite = () => {
+      if (isFavorite) {
+        mx.deleteRoomTag(room.roomId, 'm.favourite');
+      } else {
+        mx.setRoomTag(room.roomId, 'm.favourite', { order: 0.5 });
+      }
+      requestClose();
+    };
+
     const handleMarkAsRead = () => {
       markAsRead(mx, room.roomId, hideActivity);
       requestClose();
@@ -273,6 +284,17 @@ const RoomNavItemMenu = forwardRef<HTMLDivElement, RoomNavItemMenuProps>(
         </Box>
         <Line variant="Surface" size="300" />
         <Box direction="Column" gap="100" style={{ padding: config.space.S100 }}>
+          <MenuItem
+            onClick={handleToggleFavorite}
+            size="300"
+            after={<Icon size="100" src={Icons.Star} filled={isFavorite} />}
+            radii="300"
+            aria-pressed={isFavorite}
+          >
+            <Text style={{ flexGrow: 1 }} as="span" size="T300" truncate>
+              {isFavorite ? 'Remove from Favorites' : 'Add to Favorites'}
+            </Text>
+          </MenuItem>
           <MenuItem
             onClick={handleInvite}
             variant="Primary"
@@ -381,6 +403,7 @@ function RoomNavItem_({
   notificationMode,
   linkPath,
 }: RoomNavItemProps) {
+  const isFavorite = !!room.tags?.['m.favourite'];
   const mx = useMatrixClient();
   const useAuthentication = useMediaAuthentication();
   const [hover, setHover] = useState(false);
@@ -499,6 +522,15 @@ function RoomNavItem_({
                   style={{ opacity: config.opacity.P300, flexShrink: 0 }}
                 />
               )}
+              {isFavorite && (
+                <Icon
+                  size="50"
+                  src={Icons.Star}
+                  filled
+                  aria-label="Favorited"
+                  style={{ opacity: config.opacity.P300, flexShrink: 0 }}
+                />
+              )}
             </Box>
             {!optionsVisible && !unread && !selected && typingMember.length > 0 && (
               <Badge size="300" variant="Secondary" fill="Soft" radii="Pill" outlined>