Organized all the code

Updated the update notification to check periodically every 5 minutes
Added in headless browser support for extensions (check the extensions repo to see an example)
Added in DiscordRPC support

src/modules/navigation-handler.js

@@ -0,0 +1,52 @@
+import { loadFavorites } from '../favorites/favorites-loader.js';
+
+export function showPage(pageId, domRefs, callbacks, state) {
+  const {
+    browseButton,
+    favoritesButton,
+    settingsButton,
+    pageTitle,
+    headerContext,
+    favoritesGallery
+  } = domRefs;
+
+  const { updateHeader, applyLayoutToGallery, createImageCard } = callbacks;
+  const { currentLayout } = state;
+
+  document.querySelectorAll('.page').forEach((page) => {
+    page.classList.add('hidden');
+  });
+
+  document.querySelectorAll('.nav-button').forEach((tab) => {
+    tab.classList.remove('bg-indigo-600', 'text-white');
+    tab.classList.add('text-gray-400', 'hover:bg-gray-700');
+  });
+
+  const activePage = document.getElementById(pageId);
+  if (activePage) {
+    activePage.classList.remove('hidden');
+  }
+
+  let activeTab;
+  if (pageId === 'browse-page') {
+    activeTab = browseButton;
+    pageTitle.textContent = 'Browse';
+    updateHeader();
+  } else if (pageId === 'favorites-page') {
+    activeTab = favoritesButton;
+    pageTitle.textContent = 'Favorites';
+    headerContext.textContent = '';
+    
+    loadFavorites(favoritesGallery, currentLayout, applyLayoutToGallery, createImageCard);
+    
+  } else if (pageId === 'settings-page') {
+    activeTab = settingsButton;
+    pageTitle.textContent = 'Settings';
+    headerContext.textContent = '';
+  }
+
+  if (activeTab) {
+    activeTab.classList.add('bg-indigo-600', 'text-white');
+    activeTab.classList.remove('text-gray-400', 'hover:bg-gray-700');
+  }
+}