feat(demo): restore 'more features' card

Author: alvin000009238

demo/index.html

@@ -178,6 +178,19 @@ <h3 data-i18n="feature.timetable.title">輕鬆查看課表</h3>
           <p data-i18n="feature.timetable.desc">隨時隨地查看每日課表，掌握上課節次與科目。</p>
         </div>
 
+        <div class="feature-card"
+          style="display: flex; flex-direction: column; justify-content: center; align-items: center; border: 2px dashed var(--border-medium); background: transparent;">
+          <div
+            style="width: 64px; height: 64px; border-radius: 50%; background: var(--bg-secondary); display: flex; align-items: center; justify-content: center; margin-bottom: 24px;">
+            <svg style="width: 32px; height: 32px; color: var(--text-tertiary);" viewBox="0 0 24 24" fill="none"
+              stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+              <path d="M12 5v14M5 12h14" />
+            </svg>
+          </div>
+          <h3 data-i18n="feature.more.title">更多功能</h3>
+          <p data-i18n="feature.more.desc">持續開發增加中，敬請期待...</p>
+        </div>
+
       </div>
 
     </div>

demo/main.js

@@ -27,6 +27,8 @@ const translations = {
     'feature.line_graph.desc': '透過折線圖直觀呈現各科成績走勢，支援多科目同時比較，成績起伏一目了然。',
     'feature.timetable.title': '輕鬆查看課表',
     'feature.timetable.desc': '隨時隨地查看每日課表，掌握上課節次與科目。',
+    'feature.more.title': '更多功能',
+    'feature.more.desc': '持續開發增加中，敬請期待...',
     'privacy.title': '隱私與安全',
     'privacy.nopassword.title': '不保存密碼',
     'privacy.nopassword.desc': '你的密碼只在登入時使用，不會被儲存在任何地方。',
@@ -69,6 +71,8 @@ const translations = {
     'feature.line_graph.desc': 'Intuitively display grade trends for each subject through line graphs, supporting multi-subject comparisons at a glance.',
     'feature.timetable.title': 'Check Timetable Easily',
     'feature.timetable.desc': 'View your daily timetable anytime, anywhere. Keep track of class periods and subjects.',
+    'feature.more.title': 'More Features',
+    'feature.more.desc': 'More features are continually being added, stay tuned...',
     'privacy.title': 'Privacy & Security',
     'privacy.nopassword.title': 'No password storage',
     'privacy.nopassword.desc': 'Your password is only used during login and is never stored anywhere.',