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

@@ -35,10 +35,12 @@ document.addEventListener('DOMContentLoaded', () => {
 
     // Helper function to update the theme toggle button text
     function updateThemeToggleButtonText() {
-        if (body.classList.contains('dark-mode')) {
-            themeToggleButton.textContent = 'Change to Light Mode';
-        } else {
-            themeToggleButton.textContent = 'Change to Dark Mode';
+        if (themeToggleButton) {
+            if (body.classList.contains('dark-mode')) {
+                themeToggleButton.textContent = 'Change to Light Mode';
+            } else {
+                themeToggleButton.textContent = 'Change to Dark Mode';
+            }
         }
     }
 
@@ -52,11 +54,13 @@ document.addEventListener('DOMContentLoaded', () => {
     updateThemeToggleButtonText();
 
     // Toggle the theme on button click
-    themeToggleButton.addEventListener('click', () => {
-        const isDarkMode = body.classList.toggle('dark-mode');
-        safeStorage.setItem('theme', isDarkMode ? 'dark' : 'light');
-        updateThemeToggleButtonText(); // Update the button text after toggling
-    });
+    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