[st] design: 탭 디자인 수정

apps/st/src/shared/ui/tab-bar.tsx

@@ -22,7 +22,7 @@ const TabBar = () => {
         <Tabs
             value={activeTabId || undefined}
             onValueChange={setActiveTab}
-            className="w-full"
+            className="w-full border-b border-border"
             variant="outline"
         >
             <TabsList className="w-full !justify-start !p-4 !pb-0">
@@ -30,7 +30,7 @@ const TabBar = () => {
                     <TabsTrigger
                         key={tab.id}
                         value={tab.id}
-                        className="!flex !w-[140px] !items-center !justify-start !gap-2 !px-4"
+                        className="!flex !w-[140px] !items-center !justify-start !gap-2 !px-4 [&::after]:hidden"
                         title={tab.label}
                     >
                         <span className="flex-1 truncate text-xl leading-none">