Enhance release process: require clean worktree for publishing, update tagging behavior, and improve UI for audio file uploads

frontend/index.html

@@ -34,7 +34,7 @@
         </div>
         <div class="audio-upload-row">
           <label class="audio-upload-button" for="audio-file-input">↑ Upload audio</label>
-          <input id="audio-file-input" type="file" accept="audio/*,.mp3,.m4a,.aac,.ogg,.opus,.flac,.wav" />
+          <input id="audio-file-input" type="file" accept="audio/*,.mp3,.m4a,.aac,.ogg,.opus,.flac,.wav" multiple />
           <span>Files stay on this device until the server confirms storage.</span>
         </div>
         <div class="record-meter"><span id="record-meter-fill"></span></div>
@@ -59,7 +59,7 @@
       </section>
     </main>
 
-    <footer><p>Faerro KB - Copyright Andrea Ferronato © 2026</p></footer>
+    <footer><p>Faerro KB © 2026</p></footer>
     <script src="/app.js" defer></script>
   </body>
 </html>