File-Refs als Preview-Tags statt inline Text, fullText-Kollision fix, hidden-Override fix

wwwroot/index.html

@@ -123,6 +123,7 @@
     </header>
     <div class="meta-bar" id="meta"></div>
     <div id="chat"></div>
+    <div id="refPreview" class="ref-preview" hidden></div>
     <div id="filePreview" class="file-preview" hidden></div>
     <div class="input-area">
       <input type="file" id="fileInput" accept="image/jpeg,image/png,image/gif,image/webp,application/pdf" multiple hidden>