Checkpoint before follow-up message (#2074)

Co-authored-by: Cursor Agent <[email protected]>

Author: noisysocks

special-pages/pages/history/app/global/Providers/ThemeProvider.js

@@ -30,7 +30,7 @@ export function ThemeProvider({ children, initialTheme, initialThemeVariant }) {
     const [explicitThemeVariant, setExplicitThemeVariant] = useState(/** @type {ThemeVariant | undefined} */ (undefined));
 
     useEffect(() => {
-        const unsubscribe = history.messaging.subscribe('onThemeUpdate', (data) => {
+        const unsubscribe = history.onThemeUpdate((data) => {
             setExplicitTheme(data.theme);
             setExplicitThemeVariant(data.themeVariant);
         });

special-pages/pages/history/src/index.js

@@ -54,6 +54,15 @@ export class HistoryPage {
     reportInitException(params) {
         this.messaging.notify('reportInitException', params);
     }
+
+    /**
+     * Subscribe to theme update notifications from the native layer.
+     * @param {(data: import('../types/history.ts').OnThemeUpdateSubscribe) => void} callback
+     * @returns {() => void} Unsubscribe function
+     */
+    onThemeUpdate(callback) {
+        return this.messaging.subscribe('onThemeUpdate', callback);
+    }
 }
 
 const baseEnvironment = new Environment().withInjectName(import.meta.injectName).withEnv(import.meta.env);