fix: consistent avatar gradient colors across all 17 call sites

Avatar fallback gradients were hashed by display name alone when no
user prop was passed, causing the same person to appear in different
colors across messages, replies, member lists, voice panels, etc.

Added userId prop to Avatar and wired it through all 17 call sites
so the gradient always hashes by user ID.

packages/web/src/components/chat/FriendsPage.tsx

@@ -231,7 +231,7 @@ function FriendItem({ friend, onRemove, onDm }: { friend: Friend, onRemove: () =
   return (
     <div className="flex items-center justify-between px-3 h-[62px] rounded-[8px] hover:bg-interactive-hover group transition-colors border-t border-interactive-muted mx-2">
       <div className="flex items-center gap-3">
-        <Avatar src={friend.avatar} name={friend.displayName ?? friend.username} size={32} status={friend.status} />
+        <Avatar src={friend.avatar} name={friend.displayName ?? friend.username} size={32} status={friend.status} userId={friend.id} />
         <div className="flex flex-col leading-tight">
           <div className="flex items-center gap-1.5">
             <span className="text-txt-primary font-semibold text-[15px]">{friend.displayName ?? friend.username}</span>
@@ -277,7 +277,7 @@ function RequestItem({ request, type, onAccept, onDecline, onCancel }: {
   return (
     <div className="flex items-center justify-between px-3 py-2.5 rounded-lg hover:bg-interactive-hover group transition-colors border-t border-interactive-muted mx-2">
       <div className="flex items-center gap-3">
-        <Avatar src={user.avatar} name={user.displayName ?? user.username} size={32} status={user.status as any} />
+        <Avatar src={user.avatar} name={user.displayName ?? user.username} size={32} status={user.status as any} userId={user.id} />
         <div className="flex flex-col">
           <div className="flex items-center gap-1.5">
             <span className="text-txt-primary font-bold text-sm">{user.displayName ?? user.username}</span>