feat: tighten spacing between completed turns and user messages

- Assistant turn bottom padding pb-8 -> pb-2, desktop user message top
  padding pt-6 -> pt-4 (footer-to-bubble gap 60px -> 28px)
- Drop the recap note's -mt-6 that compensated the old large padding

packages/ui/src/components/chat/ChatMessage.tsx

@@ -1026,8 +1026,8 @@ const ChatMessage: React.FC<ChatMessageProps> = ({
             <div
                 className={cn(
                     'group w-full',
-                    isUser ? (isMobile ? 'pt-2' : 'pt-6') : assistantTopPaddingClass,
+                    isUser ? (isMobile ? 'pt-2' : 'pt-4') : assistantTopPaddingClass,
-                    isUser ? 'pb-0' : (isFollowedByAssistant || nextIsHiddenUserMessage) ? 'pb-0' : 'pb-8'
+                    isUser ? 'pb-0' : (isFollowedByAssistant || nextIsHiddenUserMessage) ? 'pb-0' : 'pb-2'
                 )}
                 id={`message-${message.info.id}`}
                 data-message-id={message.info.id}

packages/ui/src/components/chat/SessionRecapSpacer.tsx

@@ -22,7 +22,7 @@ export const SessionRecapNote: React.FC<SessionRecapNoteProps> = React.memo(({ s
   return (
     <div className="chat-message-column">
       {/* The last assistant turn carries pb-8 — pull the recap up into that gap. */}
-      <div className="-mt-6" aria-label={t('chat.recap.aria')}>
+      <div aria-label={t('chat.recap.aria')}>
         <span className={`typography-meta text-muted-foreground/70 ${isMobile ? 'line-clamp-4' : 'line-clamp-2'}`}>
           <span className="italic text-muted-foreground/50">{t('chat.recap.label')} </span>
           {visibleRecap}