Add missing navigation in Text Watermarking page

Author: Henry010303

clef26/pan26-web/text-watermarking.html

@@ -19,6 +19,10 @@ <h1 class="uk-margin-remove-top">Text Watermarking 2026</h1>
             <ul class="uk-list">
                 <li><span data-uk-icon="chevron-down"></span><a class="uk-margin-small-right" href="#synopsis">Synopsis</a></li>
                 <li><span data-uk-icon="chevron-down"></span><a class="uk-margin-small-right" href="#task-overview">Task Overview</a></li>
+                <li><span data-uk-icon="chevron-down"></span><a class="uk-margin-small-right" href="#submission">Submission</a></li>
+                <li><span data-uk-icon="chevron-down"></span><a class="uk-margin-small-right" href="#evaluation">Evaluation</a></li>
+                <li><span data-uk-icon="chevron-down"></span><a class="uk-margin-small-right" href="#baselines">Baselines</a></li>
+                <li><span data-uk-icon="chevron-down"></span><a class="uk-margin-small-right" href="#leaderboard">Leaderboard</a></li>
                 <li><span data-uk-icon="chevron-down"></span><a class="uk-margin-small-right" href="#related-work">Related Work</a></li>
                 <li><span data-uk-icon="chevron-down"></span><a class="uk-margin-small-right" href="#task-committee">Task Committee</a></li>
             </ul>