fix toggling of theme

public/site-scripts/theme-toggle.js

@@ -3,7 +3,7 @@
     const themeIcon = document.getElementById('theme-icon');
     
     function getStoredTheme() {
-        return localStorage.getItem('picoPreferredColorScheme') || 'auto';
+        return localStorage.getItem('picoPreferredColorScheme') || document.documentElement.getAttribute('data-theme') || 'auto';
     }
     
     function storeTheme(theme) {
@@ -14,19 +14,10 @@
         return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
     }
     
-    function applyTheme() {
-        const storedTheme = getStoredTheme();
-        let actualTheme;
+    function applyTheme(theme) {
+        document.documentElement.setAttribute('data-theme', theme);
         
-        if (storedTheme === 'auto') {
-            actualTheme = getSystemTheme();
-        } else {
-            actualTheme = storedTheme;
-        }
-        
-        document.documentElement.setAttribute('data-theme', actualTheme);
-        
-        if (actualTheme === 'dark') {
+        if (theme === 'dark') {
             themeIcon.textContent = '☀️';
             themeToggle.setAttribute('aria-pressed', 'true');
         } else {
@@ -36,19 +27,19 @@
     }
     
     function toggleTheme() {
-        const currentStored = getStoredTheme();
+        let currentStored = getStoredTheme();
+        if (currentStored === 'auto') {
+            currentStored = getSystemTheme();
+        }
+        if (currentStored === 'auto') {
+            currentStored = 'light';
+        }
         let nextTheme;
         
-        if (currentStored === 'auto') {
-            nextTheme = 'light';
-        } else if (currentStored === 'light') {
-            nextTheme = 'dark';
-        } else {
-            nextTheme = 'auto';
-        }
+        nextTheme = currentStored === 'light' ? 'dark' : 'light';
         
         storeTheme(nextTheme);
-        applyTheme();
+        applyTheme(nextTheme);
     }
     
     function init() {