Initial commit: Templates Reply Add-on für Hotel Park Soltau

Modifiziertes Templates Reply Thunderbird Add-on mit:
- HTML-Import von Netzlaufwerk
- Massen-Delete mit Checkboxen
- Deutsches UI mit "Vorlagen" Button
- 16 Hotel-Vorlagen als HTML-Dateien

background.js

@@ -0,0 +1,61 @@
+// Sluša poruke iz popupa
+browser.runtime.onMessage.addListener(async msg => {
+  if (msg.action !== 'insertTemplate') return;
+  try {
+    // 1. Nađi aktivni Compose tab
+    const [tab] = await browser.tabs.query({
+      active: true,
+      currentWindow: true,
+      windowType: 'messageCompose',
+    });
+    if (!tab) throw new Error('Nije pronađen Compose tab');
+    // 2. Dohvati postojeći sadržaj
+    const details = await browser.compose.getComposeDetails(tab.id);
+    // 3. Spoji stari i novi tekst
+    let newBody;
+    if (details.isPlainText) {
+      // 1. Grab existing text
+      const old = details.plainTextBody || '';
+
+      // 2. Build new body by prepending with two-line break spacer
+      //    If there's no old content, just use msg.text
+      newBody = msg.text + (old ? '\n' + old : '');
+
+      // 3. Set the updated plain-text body
+      await browser.compose.setComposeDetails(tab.id, {
+        plainTextBody: newBody,
+      });
+    } else {
+      const old = details.body || '';
+      // If content already contains HTML tags, use as-is; otherwise convert newlines
+      const htmlTpl = msg.text.includes('<') ? msg.text : msg.text.replace(/\n/g, '<br>');
+      const bodyTag = '<body';
+      const bodyIdx = old.indexOf(bodyTag);
+
+      if (bodyIdx !== -1) {
+        const insertAt = old.indexOf('>', bodyIdx) + 1;
+        newBody =
+          old.slice(0, insertAt) + '\n' + htmlTpl + '\n' + old.slice(insertAt);
+      } else {
+        newBody = htmlTpl + '<br>' + old;
+      }
+
+      await browser.compose.setComposeDetails(tab.id, { body: newBody });
+    }
+    // 4. Obavijest korisniku
+    await browser.notifications.create({
+      type: 'basic',
+      iconUrl: browser.runtime.getURL('icons/icon.png'),
+      title: 'Template inserted',
+      message: 'Sucessfully',
+    });
+  } catch (e) {
+    console.error('background.js error:', e);
+    browser.notifications.create({
+      type: 'basic',
+      iconUrl: browser.runtime.getURL('icons/icon.png'),
+      title: 'Error on inserting!',
+      message: e.message,
+    });
+  }
+});