Fix: Add null check for theme toggle button in script.js

- Prevents errors when theme toggle button is not present on page
- Ensures theme toggle works reliably on all pages that load script.js

py_app/app/static/script.js

@@ -35,12 +35,14 @@ document.addEventListener('DOMContentLoaded', () => {
 
     // Helper function to update the theme toggle button text
     function updateThemeToggleButtonText() {
+        if (themeToggleButton) {
             if (body.classList.contains('dark-mode')) {
                 themeToggleButton.textContent = 'Change to Light Mode';
             } else {
                 themeToggleButton.textContent = 'Change to Dark Mode';
             }
         }
+    }
 
     // Check and apply the saved theme from localStorage
     const savedTheme = safeStorage.getItem('theme');
@@ -52,11 +54,13 @@ document.addEventListener('DOMContentLoaded', () => {
     updateThemeToggleButtonText();
 
     // Toggle the theme on button click
+    if (themeToggleButton) {
         themeToggleButton.addEventListener('click', () => {
             const isDarkMode = body.classList.toggle('dark-mode');
             safeStorage.setItem('theme', isDarkMode ? 'dark' : 'light');
             updateThemeToggleButtonText(); // Update the button text after toggling
         });
+    }
 
     // Date formatting is now handled consistently on the backend