Update task overview page

Author: phoerious

shared-tasks.html

@@ -71,10 +71,25 @@ <h1>Shared Tasks</h1>
                 <td id="generated-content-analysis"></td>
                 <td>Voight-Kampff Generative AI Detection</td>
                 <td>Author Identification</td>
-                <td>[<a href="clef25/pan25-web/generated-content-analysis.html">2025</a>]
+                <td>[<a href="clef26/pan26-web/generated-content-analysis.html">2026</a>]
+                    [<a href="clef25/pan25-web/generated-content-analysis.html">2025</a>]
                     [<a href="clef24/pan24-web/generated-content-analysis.html">2024</a>]
                 </td>
             </tr>
+            <tr>
+                <td id="reasoning-trajectory-detection"></td>
+                <td>Reasoning Trajectory Detection</td>
+                <td>Author Identification</td>
+                <td>[<a href="clef26/pan26-web/reasoning-trajectory-detection.html">2026</a>]
+                </td>
+            </tr>
+            <tr>
+                <td id="text-watermarking"></td>
+                <td>Text Watermarking</td>
+                <td>Author Identification</td>
+                <td>[<a href="clef26/pan26-web/text-watermarking.html">2026</a>]
+                </td>
+            </tr>
             <tr>
                 <td id="authorship-verification"></td>
                 <td>Authorship Verification</td>
@@ -162,7 +177,8 @@ <h1>Shared Tasks</h1>
                 <td id="style-change-detection"></td>
                 <td>Style Change Detection</td>
                 <td>Multi-Author Analysis</td>
-                <td>[<a href="clef25/pan25-web/style-change-detection.html">2025</a>]
+                <td>[<a href="clef26/pan26-web/style-change-detection.html">2026</a>]
+                    [<a href="clef25/pan25-web/style-change-detection.html">2025</a>]
                     [<a href="clef24/pan24-web/style-change-detection.html">2024</a>]
                     [<a href="clef23/pan23-web/style-change-detection.html">2023</a>]
                     [<a href="clef22/pan22-web/style-change-detection.html">2022</a>]
@@ -292,7 +308,8 @@ <h1>Shared Tasks</h1>
                 <td id="generative-plagiarism-detection"></td>
                 <td>Generative Plagiarism Detection</td>
                 <td>Plagiarism Detection</td>
-                <td>[<a href="clef25/pan25-web/generated-plagiarism-detection">2025</a>]
+                <td>[<a href="clef26/pan26-web/generated-plagiarism-detection">2026</a>]
+                    [<a href="clef25/pan25-web/generated-plagiarism-detection">2025</a>]
                 </td>
             </tr>
             <tr>