implement device pairing via 6-digit code and qr-code

public/scripts/theme.js

@@ -1,5 +1,5 @@
 (function(){
-  
+
   // Select the button
   const btnTheme = document.getElementById('theme');
   // Check for dark mode preference at the OS level
@@ -8,30 +8,32 @@
   // Get the user's theme preference from local storage, if it's available
   const currentTheme = localStorage.getItem('theme');
   // If the user's preference in localStorage is dark...
-  if (currentTheme == 'dark') {
+  if (currentTheme === 'dark') {
     // ...let's toggle the .dark-theme class on the body
     document.body.classList.toggle('dark-theme');
   // Otherwise, if the user's preference in localStorage is light...
-  } else if (currentTheme == 'light') {
+  } else if (currentTheme === 'light') {
     // ...let's toggle the .light-theme class on the body
     document.body.classList.toggle('light-theme');
   }
   

-  // Listen for a click on the button 
-  btnTheme.addEventListener('click', function() {
+  // Listen for a click on the button
+  btnTheme.addEventListener('click', function(e) {
+    e.preventDefault();
     // If the user's OS setting is dark and matches our .dark-theme class...
+    let theme;
     if (prefersDarkScheme.matches) {
       // ...then toggle the light mode class
       document.body.classList.toggle('light-theme');
       // ...but use .dark-theme if the .light-theme class is already on the body,
-      var theme = document.body.classList.contains('light-theme') ? 'light' : 'dark';
+      theme = document.body.classList.contains('light-theme') ? 'light' : 'dark';
     } else {
       // Otherwise, let's do the same thing, but for .dark-theme
       document.body.classList.toggle('dark-theme');
-      var theme = document.body.classList.contains('dark-theme') ? 'dark' : 'light';
+      theme = document.body.classList.contains('dark-theme') ? 'dark' : 'light';
     }
     // Finally, let's save the current preference to localStorage to keep using it
     localStorage.setItem('theme', theme);
   });
 
-})();
+})();