style: align chat tool row spacing

Match collapsible tool height with read-only rows
Reduce extra vertical padding on reasoning rows

packages/ui/src/components/chat/message/parts/ReasoningPart.tsx

@@ -247,7 +247,7 @@ export const ReasoningTimelineBlock: React.FC<ReasoningTimelineBlockProps> = ({
                 aria-controls={contentId}
                 aria-label={toggleAriaLabel}
                 className={cn(
-                    'group/tool flex gap-1.5 pr-2 pl-px py-2 rounded-xl cursor-pointer items-center',
+                    'group/tool flex gap-1.5 pr-2 pl-px py-1.5 rounded-xl cursor-pointer items-center',
                 )}
                 onClick={handleToggle}
                 onKeyDown={handleKeyDown}

packages/ui/src/components/chat/message/parts/ToolPart.tsx

@@ -2661,7 +2661,7 @@ const ToolPart: React.FC<ToolPartProps> = ({
             {}
             <div
                 className={cn(
-                'group/tool flex gap-1.5 pr-2 pl-px py-2 rounded-xl cursor-pointer',
+                'group/tool flex gap-1.5 pr-2 pl-px py-1.5 rounded-xl cursor-pointer',
                 isMultiFileApplyPatch ? 'flex-wrap items-start' : 'items-center'
             )}
                 onClick={handleMainClick}