fix(diagnostic+app): Chat-UI bubblig, mehrzeilig + persistente RVS + STT-Logs

Diagnostic-UI:
- chat-msg ist jetzt eine richtige Bubble (border-radius 14px, Schatten,
  flex-Layout statt margin-Hack, Tail-Radius zur Sender-Seite hin).
- Eingabefelder (haupt + Vollbild) jetzt textarea mit Auto-Resize.
  Enter sendet, Shift+Enter macht neue Zeile.
- white-space: pre-wrap behaelt Zeilenumbrueche aus dem Text bei.

Diagnostic-Server:
- sendToRVS_raw nutzt jetzt die persistente rvsWs statt fuer jedes Send
  eine frische Verbindung aufzubauen. Der frische-WS-Pfad hatte Race-
  Probleme (WS schloss bevor RVS broadcasten konnte → User-Nachrichten
  von Diagnostic kamen nicht in der App an). Frische WS bleibt als
  Fallback wenn die persistente gerade tot ist.

App:
- console.log am Anfang des chat-handlers + im STT-Result-Handler mit
  findIndex-Result und Placeholder-Count. Bei nicht-erkanntem STT-Text
  liefert `adb logcat -s ReactNativeJS:V` jetzt direkt den Befund:
  kommt das Event ueberhaupt an, findet er die Placeholder?

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

diagnostic/index.html

@@ -63,24 +63,35 @@
     .log-entry.pipeline-sep { color: #333; margin: 6px 0 2px; }
 
     .chat-box { background: #080810; border: 1px solid #1E1E2E; border-radius: 6px;
-                min-height: 120px; max-height: 250px; overflow-y: auto; padding: 8px; margin-bottom: 8px; }
-    .chat-msg { margin-bottom: 6px; padding: 6px 10px; border-radius: 6px; font-size: 13px; line-height: 1.5; word-wrap: break-word; }
-    .chat-msg.sent { background: #0096FF; color: #fff; margin-left: 20%; text-align: right; }
-    .chat-msg.received { background: #1E1E2E; margin-right: 20%; }
-    .chat-msg.error { background: #3B1010; color: #FF6B6B; }
-    .chat-msg .meta { font-size: 10px; color: rgba(255,255,255,0.4); margin-top: 2px; }
+                min-height: 120px; max-height: 250px; overflow-y: auto;
+                padding: 12px; margin-bottom: 8px; display: flex; flex-direction: column; gap: 8px; }
+    .chat-msg { padding: 10px 14px; border-radius: 14px; font-size: 14px; line-height: 1.5;
+                word-wrap: break-word; max-width: 80%; white-space: pre-wrap;
+                box-shadow: 0 1px 2px rgba(0,0,0,0.4); }
+    .chat-msg.sent { background: #0096FF; color: #fff; align-self: flex-end;
+                     border-bottom-right-radius: 4px; }
+    .chat-msg.received { background: #1E1E2E; color: #E8E8F0; align-self: flex-start;
+                         border-bottom-left-radius: 4px; }
+    .chat-msg.error { background: #3B1010; color: #FF6B6B; align-self: flex-start; }
+    .chat-msg .meta { font-size: 10px; color: rgba(255,255,255,0.4); margin-top: 4px;
+                      display: block; }
     .chat-msg a { color: #66BBFF; text-decoration: underline; }
     .chat-msg.sent a { color: #CCEEFF; }
-    .chat-msg .chat-media { max-width: 100%; max-height: 200px; border-radius: 4px; margin-top: 4px; cursor: pointer; display: block; }
+    .chat-msg .chat-media { max-width: 100%; max-height: 200px; border-radius: 8px;
+                            margin-top: 6px; cursor: pointer; display: block; }
     .chat-msg .chat-media:hover { opacity: 0.85; }
     .lightbox-overlay { display:none; position:fixed; top:0; left:0; right:0; bottom:0; background:rgba(0,0,0,0.92);
                         z-index:2000; justify-content:center; align-items:center; cursor:pointer; }
     .lightbox-overlay.open { display:flex; }
     .lightbox-overlay img, .lightbox-overlay video { max-width:95vw; max-height:95vh; border-radius:8px; }
 
-    .input-row { display: flex; gap: 6px; }
-    .input-row input { flex: 1; background: #1E1E2E; border: 1px solid #333; border-radius: 6px;
-                       padding: 8px 12px; color: #E0E0F0; font-family: inherit; font-size: 13px; }
+    .input-row { display: flex; gap: 6px; align-items: flex-end; }
+    .input-row input, .input-row textarea {
+        flex: 1; background: #1E1E2E; border: 1px solid #333; border-radius: 6px;
+        padding: 8px 12px; color: #E0E0F0; font-family: inherit; font-size: 13px;
+    }
+    .input-row textarea { resize: none; min-height: 38px; max-height: 200px; line-height: 1.4;
+                          overflow-y: auto; }
 
     /* Terminal Modal */
     .modal-overlay { display:none; position:fixed; top:0; left:0; right:0; bottom:0; background:rgba(0,0,0,0.85);
@@ -282,7 +293,7 @@
           📎
           <input type="file" id="diag-file-input" multiple accept="image/*,application/pdf,.doc,.docx,.txt" style="display:none;" onchange="handleDiagFileSelect(this.files)">
         </label>
-        <input type="text" id="chat-input" placeholder="Nachricht an ARIA..." onpaste="handleDiagPaste(event)">
+        <textarea id="chat-input" placeholder="Nachricht an ARIA... (Enter sendet, Shift+Enter neue Zeile)" rows="2" onpaste="handleDiagPaste(event)" oninput="autoResizeTextarea(this)"></textarea>
         <button class="btn" id="btn-gw" onclick="testGateway()">Gateway senden</button>
         <button class="btn" id="btn-rvs" onclick="testRVS()">Via RVS senden</button>
       </div>
@@ -300,7 +311,7 @@
       <span style="animation:pulse 1s infinite;">&#x1F4AD;</span> <span id="thinking-text-fs">ARIA denkt...</span>
     </div>
     <div class="input-row" style="margin-top:8px;">
-      <input type="text" id="chat-input-fs" placeholder="Nachricht an ARIA..." onkeydown="if(event.key==='Enter'){testRVSFS();event.preventDefault();}">
+      <textarea id="chat-input-fs" placeholder="Nachricht an ARIA... (Enter sendet, Shift+Enter neue Zeile)" rows="2" oninput="autoResizeTextarea(this)"></textarea>
       <button class="btn" onclick="testGatewayFS()">Gateway senden</button>
       <button class="btn" onclick="testRVSFS()">Via RVS senden</button>
     </div>
@@ -2069,10 +2080,23 @@
       return str.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
     }
 
-    // Enter-Taste sendet via Gateway
-    document.getElementById('chat-input').addEventListener('keydown', (e) => {
-      if (e.key === 'Enter') testRVS();
-    });
+    // Auto-Resize fuer Textarea — wuchst mit dem Inhalt bis zum max-height
+    function autoResizeTextarea(el) {
+      el.style.height = 'auto';
+      el.style.height = Math.min(el.scrollHeight, 200) + 'px';
+    }
+
+    // Enter sendet, Shift+Enter macht neue Zeile (chat-Standard).
+    function chatInputKeydown(e, sendFn) {
+      if (e.key === 'Enter' && !e.shiftKey) {
+        e.preventDefault();
+        sendFn();
+        // Textarea zurueck auf 2 rows setzen
+        e.target.style.height = 'auto';
+      }
+    }
+    document.getElementById('chat-input').addEventListener('keydown', (e) => chatInputKeydown(e, testRVS));
+    document.getElementById('chat-input-fs').addEventListener('keydown', (e) => chatInputKeydown(e, testRVSFS));
 
     // Escape schliesst Lightbox
     document.addEventListener('keydown', (e) => {