refactor: implement unidirectional data flow with dispatcher pattern

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

main.c

@@ -7,13 +7,19 @@
 #include "tui.h"
 #include "cli.h"
 #include "gui.h"
+#include "dispatcher.h"
 
 static Engine engine;
 static volatile int keep_running = 1;
+static DispatchFn dispatch = NULL;
 
 void signal_handler(int sig) {
     (void)sig;
     keep_running = 0;
+    if (dispatch) {
+        Action action = { .type = ACTION_QUIT };
+        dispatch(action);
+    }
 }
 
 void print_usage(const char *program) {
@@ -63,22 +69,45 @@ int main(int argc, char *argv[]) {
         }
     }
     
+    // Create initial state
+    AppState initial_state;
+    memset(&initial_state, 0, sizeof(AppState));
+    initial_state.transport_state = TRANSPORT_STOPPED;
+    initial_state.clock_source = CLOCK_SOURCE_INTERNAL;
+    initial_state.bpm = 120.0;
+    initial_state.quantize_mode = QUANTIZE_OFF;
+    initial_state.quantize_threshold = 0;
+    initial_state.running = true;
+    
+    for (int i = 0; i < MAX_CLIPS; i++) {
+        initial_state.clips[i].state = CLIP_EMPTY;
+        initial_state.clips[i].buffer = (float *)calloc(MAX_BUFFER_SIZE, sizeof(float));
+        initial_state.clips[i].buffer_size = 0;
+        initial_state.clips[i].write_position = 0;
+        initial_state.clips[i].read_position = 0;
+    }
+    
+    // Initialize dispatcher
+    dispatch = dispatcher_init(&initial_state);
+    
     // Initialize engine
-    if (engine_init(&engine, client_name) != 0) {
+    if (engine_init(&engine, client_name, dispatch) != 0) {
         fprintf(stderr, "Failed to initialize engine\n");
         return 1;
     }
     
-    engine.control_channel = control_channel;
-    
     // Set up signal handler
     signal(SIGINT, signal_handler);
     signal(SIGTERM, signal_handler);
     
+    // Start dispatcher
+    dispatcher_start();
+    
     // Start engine
     if (engine_start(&engine) != 0) {
         fprintf(stderr, "Failed to start engine\n");
         engine_cleanup(&engine);
+        dispatcher_stop();
         return 1;
     }
     
@@ -107,6 +136,7 @@ int main(int argc, char *argv[]) {
     printf("\nShutting down...\n");
     engine_stop(&engine);
     engine_cleanup(&engine);
+    dispatcher_stop();
     
     return 0;
 }