File Explorer Modal: Workspace-Browser mit Textvorschau, Zeilennummern, Selektion als File-Picker im Chat

wwwroot/index.html

@@ -12,6 +12,7 @@
   <link rel="stylesheet" href="css/dashboard.css">
   <link rel="stylesheet" href="css/chat.css">
   <link rel="stylesheet" href="css/placeholder.css">
+  <link rel="stylesheet" href="css/file-explorer.css">
 </head>
 <body>
 
@@ -125,6 +126,7 @@
     <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>
+      <button id="explorerBtn" class="file-btn" title="Workspace durchsuchen">📂</button>
       <button id="fileBtn" class="file-btn" title="Datei anhängen">📎</button>
       <textarea id="input" placeholder="Nachricht eingeben... (Ctrl+Enter)" rows="2"></textarea>
       <button id="send">Senden</button>
@@ -149,6 +151,7 @@
 <script src="js/ui.js"></script>
 <script src="js/api.js"></script>
 <script src="js/session.js"></script>
+<script src="js/file-explorer.js"></script>
 <script src="js/chat.js"></script>
 <script src="js/history.js"></script>
 <script src="js/router.js"></script>