style(fe): restore Quick Links Toolbar in header according to user specifications

frontend/src/shared/shell/KsHeader.vue

@@ -93,18 +93,42 @@ const toggleTheme = () => {
         </div>
       </div>
 
-      <!-- Quick Menu (빠른 메뉴) -->
-      <div class="ks-header__quick-menu" title="자주 찾는 화면 빠른 이동">
+      <!-- Quick Links Toolbar (주요 화면 바로가기 퀵 툴바) -->
+      <nav class="ks-header__quick-toolbar" aria-label="주요 화면 빠른 이동">
         <span class="ks-header__quick-label">⚡ 빠른메뉴:</span>
-        <select class="ks-header__quick-select" aria-label="빠른 메뉴 이동" @change="onQuickSelect">
-          <option value="" disabled selected>주요 업무 화면 선택...</option>
-          <option value="/model-ops/models-master">📂 트레이딩 모델 마스터</option>
-          <option value="/ops/data-quality">📊 데이터 품질 검증</option>
-          <option value="/model-ops/shadow-runs">⚡ Shadow Run 실행/추적</option>
-          <option value="/approvals/workbench">📝 결재/승인 워크벤치</option>
-          <option value="/decisions/sell">📈 매도 의사결정 모니터링</option>
-        </select>
-      </div>
+        <button
+          type="button"
+          class="ks-header__quick-btn"
+          title="트레이딩 모델 마스터"
+          @click="router.push('/model-ops/models-master')"
+        >
+          📂 모델 마스터
+        </button>
+        <button
+          type="button"
+          class="ks-header__quick-btn"
+          title="데이터 품질 검증"
+          @click="router.push('/ops/data-quality')"
+        >
+          📊 데이터 품질
+        </button>
+        <button
+          type="button"
+          class="ks-header__quick-btn"
+          title="Shadow Run 실행/추적"
+          @click="router.push('/model-ops/shadow-runs')"
+        >
+          ⚡ Shadow Run
+        </button>
+        <button
+          type="button"
+          class="ks-header__quick-btn"
+          title="결재/승인 워크벤치"
+          @click="router.push('/approvals/workbench')"
+        >
+          📝 결재 워크벤치
+        </button>
+      </nav>
 
       <!-- Right side actions -->
       <div class="ks-header__end">
@@ -297,39 +321,44 @@ const toggleTheme = () => {
   color: var(--color-primary-500);
 }
 
-.ks-header__quick-menu {
+.ks-header__quick-toolbar {
   display: flex;
   align-items: center;
-  gap: var(--ks-space-2);
+  gap: 6px;
   flex: 1;
-  max-width: 380px;
+  max-width: 600px;
 }
 
 .ks-header__quick-label {
-  font-size: var(--ks-font-body);
+  font-size: 11px;
   font-weight: 700;
   color: var(--ks-color-action);
   white-space: nowrap;
+  margin-right: 2px;
 }
 
-.ks-header__quick-select {
-  flex: 1;
-  height: var(--ks-control-height);
-  padding: 0 var(--ks-space-2);
+.ks-header__quick-btn {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  height: 24px;
+  padding: 0 8px;
+  background: var(--ks-color-surface);
   border: 1px solid var(--ks-color-neutral-300);
   border-radius: var(--ks-radius-sm);
-  background: var(--ks-color-surface);
-  color: var(--ks-color-neutral-900);
-  font-size: var(--ks-font-body);
-  font-family: inherit;
+  color: var(--ks-color-neutral-700);
+  font-size: 11px;
+  font-weight: 600;
   cursor: pointer;
-  box-sizing: border-box;
+  white-space: nowrap;
   transition: all 0.15s ease;
 }
 
-.ks-header__quick-select:hover {
+.ks-header__quick-btn:hover {
+  background: #e0f2fe;
+  color: var(--ks-color-action);
   border-color: var(--ks-color-action);
-  background: #f8fafc;
+  box-shadow: 0 1px 2px rgba(37, 99, 235, 0.12);
 }
 
 .ks-header__end {