feat(diagnostic): GPS-Position als Debug-Block in Chat einblendbar

Toggle 'GPS-Position einblenden' rechts neben 'TTS-Text einblenden'.
Wenn aktiv und ein chat-Event hat ein location-Feld, erscheint unter
der Bubble ein gruener Block mit lat/lon — Klick oeffnet OpenStreetMap
am Punkt.

Nur Diagnostic, keine Anzeige in der App. Der Block taucht nur bei
User-/STT-/Diagnostic-Nachrichten auf (sender != aria), weil aria-core
sich nicht selbst lokalisiert.

Toggle-State wird in localStorage persistiert (aria-show-gps-debug).

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

diagnostic/index.html

@@ -278,6 +278,10 @@
             <input type="checkbox" id="tts-debug-toggle" onchange="toggleTtsDebug()" style="margin-right:4px;vertical-align:middle;">
             TTS-Text einblenden
           </label>
+          <label style="color:#8888AA;font-size:11px;cursor:pointer;">
+            <input type="checkbox" id="gps-debug-toggle" onchange="toggleGpsDebug()" style="margin-right:4px;vertical-align:middle;">
+            GPS-Position einblenden
+          </label>
           <button class="btn secondary" onclick="toggleChatFullscreen()" id="btn-chat-fs" style="padding:4px 10px;font-size:11px;">Vollbild</button>
         </div>
       </div>
@@ -1004,7 +1008,7 @@
           if (sender === 'aria') return;
           const chatType = 'sent';
           const label = sender === 'stt' ? '\uD83C\uDFA4 Spracheingabe' : `via RVS (${sender})`;
-          addChat(chatType, p.text || '?', label);
+          addChat(chatType, p.text || '?', label, { location: p.location });
           return;
         }
         if (msg.type === 'proxy_result') {
@@ -1395,6 +1399,16 @@
       if (el) el.checked = showTtsDebug;
     }
 
+    // Debug-Toggle: GPS-Position unter User-Nachrichten einblenden (nur Diagnostic).
+    // App zeigt's bewusst nicht — die Position geht nur an aria-core.
+    let showGpsDebug = localStorage.getItem('aria-show-gps-debug') === '1';
+    function toggleGpsDebug() {
+      showGpsDebug = !showGpsDebug;
+      localStorage.setItem('aria-show-gps-debug', showGpsDebug ? '1' : '0');
+      const el = document.getElementById('gps-debug-toggle');
+      if (el) el.checked = showGpsDebug;
+    }
+
     // Minimal-JS-Port von clean_text_for_tts() (Bridge) — reine Anzeige
     function previewTtsText(text) {
       if (!text) return '';
@@ -1434,7 +1448,18 @@
           ttsBlock = `<div style="margin-top:6px;padding:4px 8px;background:rgba(0,150,255,0.08);border-left:2px solid #0096FF;font-size:11px;color:#88AACC;"><span style="color:#0096FF;font-weight:bold;">TTS:</span> ${escapeHtml(ttsText)}</div>`;
         }
       }
-      const html = `${linked}${ttsBlock}<div class="meta">${escapeHtml(meta)} — ${new Date().toLocaleTimeString('de-DE')}</div>`;
+      // Optional: GPS-Position als Block unter User-Nachrichten (nur Diagnostic)
+      let gpsBlock = '';
+      if (showGpsDebug && options && options.location) {
+        const loc = options.location;
+        const lat = typeof loc.lat === 'number' ? loc.lat.toFixed(6) : '?';
+        const lon = typeof loc.lon === 'number' ? loc.lon.toFixed(6) : (typeof loc.lng === 'number' ? loc.lng.toFixed(6) : '?');
+        if (lat !== '?' && lon !== '?') {
+          const mapLink = `https://www.openstreetmap.org/?mlat=${lat}&mlon=${lon}#map=16/${lat}/${lon}`;
+          gpsBlock = `<div style="margin-top:6px;padding:4px 8px;background:rgba(52,199,89,0.08);border-left:2px solid #34C759;font-size:11px;color:#88BB99;"><span style="color:#34C759;font-weight:bold;">📍 GPS:</span> <a href="${mapLink}" target="_blank" rel="noopener" style="color:#88BB99;text-decoration:underline;">${lat}, ${lon}</a></div>`;
+        }
+      }
+      const html = `${linked}${ttsBlock}${gpsBlock}<div class="meta">${escapeHtml(meta)} — ${new Date().toLocaleTimeString('de-DE')}</div>`;
 
       // Thinking-Indikator ausblenden bei neuer Nachricht
       updateThinkingIndicator({ activity: 'idle' });
@@ -2451,6 +2476,8 @@
     // Toggle-Checkbox initial korrekt setzen
     const ttsToggleEl = document.getElementById('tts-debug-toggle');
     if (ttsToggleEl) ttsToggleEl.checked = showTtsDebug;
+    const gpsToggleEl = document.getElementById('gps-debug-toggle');
+    if (gpsToggleEl) gpsToggleEl.checked = showGpsDebug;
 
     // Disk-Space Banner aktualisieren (wird vom Server via disk_status gepusht)
     function updateDiskBanner(status) {