chore: checkpoint current working state

extension/popup.js

@@ -2,6 +2,10 @@ const profileSelect = document.getElementById('profileSelect');
 const statusEl = document.getElementById('status');
 const debugToggle = document.getElementById('debugLoggingToggle');
 
+function isValidProfileNumber(value) {
+  return Number.isInteger(value) && value >= 1 && value <= 5;
+}
+
 function apiFetch(url, options = {}) {
   const config = {
     ...options,
@@ -61,7 +65,7 @@ function updateStatus(message, saved = false) {
 
 async function initProfileSelect() {
   const backendProfile = await fetchProfileState();
-  if (backendProfile) {
+  if (isValidProfileNumber(backendProfile)) {
     profileSelect.value = String(backendProfile);
     chrome.storage.sync.set({ profileNumber: backendProfile });
     updateStatus(`Profil ${backendProfile} ausgewählt`);
@@ -69,9 +73,14 @@ async function initProfileSelect() {
   }
 
   chrome.storage.sync.get(['profileNumber'], (result) => {
-    const profileNumber = result.profileNumber || 1;
-    profileSelect.value = String(profileNumber);
-    updateStatus(`Profil ${profileNumber} ausgewählt (lokal)`);
+    const profileNumber = result.profileNumber;
+    if (isValidProfileNumber(profileNumber)) {
+      profileSelect.value = String(profileNumber);
+      updateStatus(`Profil ${profileNumber} ausgewählt (lokal)`);
+      return;
+    }
+    profileSelect.value = '';
+    updateStatus('Bitte zuerst ein Profil auswählen.');
   });
 }
 
@@ -101,6 +110,10 @@ function reloadFacebookTabs() {
 
 document.getElementById('saveBtn').addEventListener('click', async () => {
   const profileNumber = parseInt(profileSelect.value, 10);
+  if (!isValidProfileNumber(profileNumber)) {
+    updateStatus('Bitte zuerst ein Profil auswählen.');
+    return;
+  }
 
   chrome.storage.sync.set({ profileNumber }, async () => {
     updateStatus(`Profil ${profileNumber} gespeichert!`, true);