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/features/room/message/Message.tsx

@@ -785,7 +785,7 @@ export const Message = as<'div', MessageProps>(
     const senderAvatarMxc = getMemberAvatarMxc(room, senderId);
 
     // Get custom user color from avatar metadata (takes priority)
-    const customUserColor = useOtherUserColor(senderId, senderAvatarMxc);
+    const customUserColor = useOtherUserColor(senderId, room);
 
     const tagColor = memberPowerTag?.color
       ? accessibleTagColors?.get(memberPowerTag.color)