Merge branch 'dev' into codex/reduce-header-height-for-better-ux-w2l7ar

Author: alvin000009238

frontend/styles/header.css

@@ -173,7 +173,7 @@
 
     display: flex;
 
-    align-items: center;
+    align-items: flex-end;
 
     gap: 10px;
 

public/index.html

@@ -77,6 +77,7 @@ <h1>成績分析平台</h1>
                     </div>
                 </div>
                 <div class="data-time-box">
+                    <span class="header-status-badge" id="headerStatusBadge" aria-live="polite"></span>
                     <div class="time-info">
 
                         <span class="time-label" id="updateTimeLabel">資料更新時間</span>