Design: 버튼 디자인 변경

frontend/src/components/AdminProjectSidebar/index.tsx

@@ -43,7 +43,7 @@ export default function AdminProjectSidebar(): JSX.Element {
             <SquarePen size={16} />
           </button>
           <ProjectCreateModal
-            buttonClass="caption border-gray-800 bg-gray-100"
+            buttonClass="caption bg-gray-100"
             onSubmit={handleCreateProject}
           />
         </header>

frontend/src/components/WorkspaceSidebar/index.tsx

@@ -36,7 +36,7 @@ export default function WorkspaceSidebar({ workspaceName, projects }: { workspac
           </button>
           <ProjectCreateModal
             onSubmit={(data) => console.log('프로젝트 생성:', data)}
-            buttonClass="caption border-primary bg-gray-50"
+            buttonClass="caption bg-gray-50"
           />
         </header>
         <div className="p-2">

frontend/src/pages/WorkspaceBrowseDetail.tsx

@@ -63,7 +63,7 @@ function HeaderSection({
       <div className="flex flex-col">
         <div className="flex gap-3">
           <ProjectCreateModal
-            buttonClass="mt-4 flex items-center gap-2 body-small-strong"
+            buttonClass="flex items-center gap-2 body-small-strong h-10 px-4 py-2"
             onSubmit={onCreateProject}
           />
         </div>