fix(navigation): 当前账号卡片与导航菜单等宽展示且避免用户名截断

frontend/src/views/Dashboard/DashboardNavigation.css

@@ -120,15 +120,25 @@
 .navigation-account-card {
   display: flex;
   flex-direction: column;
-  gap: 6px;
-  margin: 0 4px 10px;
-  padding: 10px 12px;
+  gap: 8px;
+  width: 100%;
+  box-sizing: border-box;
+  margin: 0 0 10px;
+  padding: 12px;
   border: 1px solid #e2e8f2;
-  border-radius: 12px;
+  border-radius: 10px;
   background: #f8faff;
   color: #1e293b;
 }
 
+.navigation-account-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 8px;
+  width: 100%;
+}
+
 .navigation-account-label {
   color: #64748b;
   font-size: 12px;
@@ -139,7 +149,9 @@
 .navigation-account-row {
   display: flex;
   align-items: center;
+  justify-content: space-between;
   gap: 8px;
+  width: 100%;
   min-width: 0;
 }
 
@@ -150,6 +162,8 @@
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
+  flex: 1 1 auto;
+  min-width: 0;
 }
 
 .navigation-role-badge {

frontend/src/views/Dashboard/DashboardNavigation.vue

@@ -82,13 +82,8 @@ defineEmits(["select", "settings"]);
     </button>
     <div class="navigation-session">
       <div v-if="currentUser" class="navigation-account-card" aria-label="当前登录账号">
-        <div class="navigation-account-label">当前账号</div>
-        <div class="navigation-account-row">
-          <strong class="navigation-account-name" :title="currentUser.account">{{ currentUser.account || "未命名账号" }}</strong>
-          <span
-            class="navigation-role-badge"
-            :class="`role-${currentUser.role}`"
-          >{{ roleLabels[currentUser.role] || "未知权限" }}</span>
+        <div class="navigation-account-header">
+          <div class="navigation-account-label">当前账号</div>
           <button
             class="navigation-logout-btn navigation-logout"
             type="button"
@@ -105,6 +100,13 @@ defineEmits(["select", "settings"]);
             <span class="navigation-logout-sr">{{ loggingOut ? "退出中…" : "退出登录" }}</span>
           </button>
         </div>
+        <div class="navigation-account-row">
+          <strong class="navigation-account-name" :title="currentUser.account">{{ currentUser.account || "未命名账号" }}</strong>
+          <span
+            class="navigation-role-badge"
+            :class="`role-${currentUser.role}`"
+          >{{ roleLabels[currentUser.role] || "未知权限" }}</span>
+        </div>
       </div>
       <div v-else class="navigation-session-anon">
         <button