feat(export): Ersteller im Export-Dialog manuell eingebbar

Der Export-Dialog hat ein neues optionales Feld "Ersteller". Ist es
gefuellt, wird dieser Name im Bericht als Ersteller verwendet; bleibt es
leer, gilt wie bisher die E-Mail des Lage-Erstellers.

- export_incident: optionaler Query-Parameter creator, hat Vorrang vor
  der E-Mail-Ableitung
- exportReport (api.js) haengt creator an die Export-URL
- submitExport (app.js) liest das neue Feld aus
- Eingabefeld im Export-Modal (dashboard.html)

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

src/static/dashboard.html

@@ -805,12 +805,12 @@
     <script src="/static/vendor/leaflet.js"></script>
     <script src="/static/vendor/leaflet.markercluster.js"></script>
     <script src="/static/js/i18n.js?v=20260513a"></script>
-    <script src="/static/js/api.js?v=20260522e"></script>
+    <script src="/static/js/api.js?v=20260522f"></script>
     <script src="/static/js/ws.js?v=20260316b"></script>
     <script src="/static/js/components.js?v=20260522d"></script>
     <script src="/static/js/layout.js?v=20260513f"></script>
     <script src="/static/js/pipeline.js?v=20260513d"></script>
-    <script src="/static/js/app.js?v=20260522e"></script>
+    <script src="/static/js/app.js?v=20260522f"></script>
     <script src="/static/js/cluster-data.js?v=20260322f"></script>
     <script src="/static/js/tutorial.js?v=20260316z"></script>
     <script src="/static/js/chat.js?v=20260514e"></script>
@@ -855,6 +855,11 @@
                     <label class="export-radio"><input type="radio" name="export-branding" value="on" checked><span data-i18n="export.branding.on">Mit AegisSight-Branding</span></label>
                     <label class="export-radio"><input type="radio" name="export-branding" value="off"><span data-i18n="export.branding.off">Ohne Firmen-Branding</span></label>
                 </div>
+                <div style="margin-bottom:0;">
+                    <label for="export-ersteller" style="font-size:11px;text-transform:uppercase;letter-spacing:1px;color:var(--text-secondary);display:block;margin-bottom:8px;">Ersteller</label>
+                    <input type="text" id="export-ersteller" maxlength="120" placeholder="Name des Erstellers (optional)" style="width:100%;box-sizing:border-box;">
+                    <div style="font-size:11px;color:var(--text-secondary);margin-top:6px;">Leer lassen, dann wird automatisch der Lage-Ersteller verwendet.</div>
+                </div>
             </div>
             <div class="modal-footer" style="padding:12px 20px;display:flex;justify-content:flex-end;gap:8px;border-top:1px solid var(--border);">
                 <button class="btn btn-secondary" onclick="closeModal('modal-export')" data-i18n="common.cancel">Abbrechen</button>