Fix: Signaturen-Tab lädt erste Identität automatisch

- "Bitte wählen" Placeholder entfernt
- Erste Identität wird beim Laden direkt ausgewählt
- Signatur wird sofort in den Editor geladen (kein manuelles Umschalten nötig)

templates_options/templates_options.html

@@ -860,7 +860,6 @@
             <div class="form-group">
                 <label for="sig-identity-select">Identität / E-Mail-Adresse</label>
                 <select id="sig-identity-select" style="width:100%;">
-                    <option value="">— Bitte wählen —</option>
                 </select>
             </div>
 

templates_options/templates_options.js

@@ -1002,7 +1002,7 @@ function updateSigEditorState(source) {
 
 async function loadIdentities() {
     allIdentities = [];
-    sigIdentitySelect.innerHTML = '<option value="">— Bitte wählen —</option>';
+    sigIdentitySelect.innerHTML = '';
 
     const accounts = await browser.accounts.list();
     for (const account of accounts) {
@@ -1026,10 +1026,24 @@ async function loadIdentities() {
         }
     }
 
-    // Auto-select first identity and trigger change
-    if (allIdentities.length > 0 && !sigIdentitySelect.value) {
-        sigIdentitySelect.value = allIdentities[0].id;
-        sigIdentitySelect.dispatchEvent(new Event('change'));
+    // Auto-select first identity and load signature directly
+    if (allIdentities.length > 0) {
+        const first = allIdentities[0];
+        sigIdentitySelect.value = first.id;
+
+        const sourceMap = await getSigSourceMap();
+        const source = sourceMap[first.email.toLowerCase()] || 'own';
+        updateSigSourceDropdown(first.email);
+        sigSourceSelect.value = source;
+
+        if (source.startsWith('=')) {
+            const srcEmail = source.substring(1);
+            const srcIdentity = allIdentities.find(i => i.email.toLowerCase() === srcEmail);
+            sigEditorArea.innerHTML = extractHeader(srcIdentity ? (srcIdentity.signature || '') : '');
+        } else {
+            sigEditorArea.innerHTML = extractHeader(first.signature || '');
+        }
+        updateSigEditorState(source);
     }
 }
 
@@ -1627,7 +1641,7 @@ window.addEventListener('load', async () => {
     renderTemplates(templates);
     updateTplSyncIndicator();
     loadSyncConfig();
-    loadIdentities();
+    await loadIdentities();
 
     checkForServerUpdates();
     setInterval(checkForServerUpdates, 30000);