Add MSC4522 username colors, release notes dialog, and profile layout fixes.

Replace legacy profile style metadata with MSC4133 profile fields, add in-app update notes, tighten account profile name spacing, and wire desktop media save helpers through the client.

src/app/pages/client/ClientNonUIFeatures.tsx

@@ -58,6 +58,7 @@ import {
   listenForAndroidShares,
   materializeSharedFile,
 } from '../../utils/androidShare';
+import { UpdatesDialogHost } from '../../components/updates-dialog';
 
 /**
  * Applies the selected emoji style font to the document.
@@ -698,6 +699,7 @@ export function ClientNonUIFeatures({ children }: ClientNonUIFeaturesProps) {
       <MessageNotifications />
       <BackgroundSyncSetup />
       <PaarrotAPIInitializer />
+      <UpdatesDialogHost />
       <TaskbarFlashStopper />
       <AndroidShareIntentHandler />
       {children}

src/app/pages/client/inbox/Notifications.tsx

@@ -237,7 +237,7 @@ function NotificationItem({
     relation?.rel_type === RelationType.Thread ? relation.event_id : undefined;
 
   // Get custom user color from avatar metadata
-  const customUserColor = useOtherUserColor(event.sender, senderAvatarMxc);
+  const customUserColor = useOtherUserColor(event.sender, room);
 
   const memberPowerTag = getMemberPowerTag(event.sender);
   const tagColor = memberPowerTag?.color