fix: use pointer to dispatcher state in process callback for real-time access

Co-authored-by: aider (deepseek/deepseek-coder) <aider@aider.chat>

dispatcher.c

@@ -117,6 +117,10 @@ void dispatcher_get_state(AppState *out) {
     pthread_mutex_unlock(&dispatcher.state_mutex);
 }
 
+AppState* dispatcher_get_state_ptr(void) {
+    return &dispatcher.state;
+}
+
 // ============================================================
 // Reducer implementation
 // ============================================================