Feature: WYSIWYG-Editor, Gitea-Sync, Signaturen-Verwaltung

- WYSIWYG-Editor mit contenteditable statt Textarea (MDI-Icons, System-Fonts, Farbwähler)
- Gitea-Sync: Templates per Abteilung aus Git-Repo laden/hochladen mit Commit-Author
- Abteilungsordner + _gemeinsam Ordner, einzelnes Pull/Push pro Vorlage
- Sync-Status pro Vorlage (grün/rot/grau Ampel), persistent über Neustarts
- Signaturen-Tab: Identitäten bearbeiten, aus Datei laden, Sync über signatures/ Ordner
- Persönliche Signaturen für geteilte E-Mail-Adressen (pro Mitarbeiter)
- Tab-Navigation: Vorlagen, Signaturen, Synchronisierung
- Auto-Pull beim Thunderbird-Start (Templates + Signaturen)

popup.js

@@ -13,9 +13,17 @@ async function getTemplates() {
 }
 
 function insertTemplateAndClose(templateText) {
+    // Check if a prefix template is selected
+    const prefixSelect = document.getElementById('prefix-select');
+    const prefixContent = prefixSelect ? prefixSelect.value : '';
+
+    const combinedText = prefixContent
+        ? prefixContent + '<br>' + templateText
+        : templateText;
+
     browser.runtime.sendMessage({
         action: 'insertTemplate',
-        text: templateText
+        text: combinedText
     }).catch(e => console.error("Error sending message to background:", e));
     window.close();
 }
@@ -39,6 +47,34 @@ async function renderPopupButtons() {
         return;
     }
 
+    // Populate prefix dropdown
+    const prefixSection = document.getElementById('prefix-section');
+    const prefixSelect = document.getElementById('prefix-select');
+    if (templates.length > 1) {
+        prefixSection.style.display = '';
+        templates.forEach(template => {
+            const option = document.createElement('option');
+            option.value = template.content;
+            option.textContent = template.name;
+            option.dataset.name = template.name;
+            prefixSelect.appendChild(option);
+        });
+
+        // Restore last selection
+        const saved = await browser.storage.local.get('last_prefix');
+        if (saved.last_prefix) {
+            const match = [...prefixSelect.options].find(o => o.dataset.name === saved.last_prefix);
+            if (match) prefixSelect.value = match.value;
+        }
+
+        // Save selection on change
+        prefixSelect.addEventListener('change', () => {
+            const selected = prefixSelect.selectedOptions[0];
+            const name = selected?.dataset?.name || '';
+            browser.storage.local.set({ last_prefix: name });
+        });
+    }
+
     templates.forEach(template => {
         const button = document.createElement('button');
         button.textContent = template.name;