refactor: convert MidiClip events to dynamic allocation to reduce stack size

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

dispatcher.c

@@ -495,6 +495,7 @@ AppState reducer(AppState state, Action action) {
                 state.midi_clips[idx].state = CLIP_EMPTY;
                 state.midi_clips[idx].event_count = 0;
                 state.midi_clips[idx].read_index = 0;
+                // Don't free events here - just reset count
             }
             return state;
         }
@@ -526,6 +527,13 @@ AppState reducer(AppState state, Action action) {
                 } else {
                     clip->buffer = (float *)calloc(MAX_BUFFER_SIZE, sizeof(float));
                 }
+                
+                // NEW: Reset midi clips
+                MidiClip *mclip = &state.midi_clips[i];
+                mclip->state = CLIP_EMPTY;
+                mclip->event_count = 0;
+                mclip->read_index = 0;
+                // events pointer should already be valid from init
             }
             
             // Reset Carla host
@@ -595,6 +603,15 @@ static void* dispatcher_thread_func(void *arg) {
 
 DispatchFn dispatcher_init(AppState *initial_state) {
     memcpy(&dispatcher.state, initial_state, sizeof(AppState));
+    
+    // NEW: Ensure midi clip events are allocated (in case initial_state has NULL pointers)
+    for (int i = 0; i < MAX_CLIPS; i++) {
+        if (dispatcher.state.midi_clips[i].events == NULL) {
+            dispatcher.state.midi_clips[i].events = (MidiEvent *)calloc(MAX_MIDI_EVENTS, sizeof(MidiEvent));
+            dispatcher.state.midi_clips[i].max_events = MAX_MIDI_EVENTS;
+        }
+    }
+    
     atomic_store(&dispatcher.running, false);
     atomic_store(&dispatcher.write_index, 0);
     atomic_store(&dispatcher.read_index, 0);
@@ -617,6 +634,12 @@ void dispatcher_stop(void) {
     pthread_cond_signal(&dispatcher.action_cond);
     pthread_join(dispatcher.thread, NULL);
     
+    // NEW: Free midi clip events
+    for (int i = 0; i < MAX_CLIPS; i++) {
+        free(dispatcher.state.midi_clips[i].events);
+        dispatcher.state.midi_clips[i].events = NULL;
+    }
+    
     pthread_mutex_lock(&dispatcher.subscribers_mutex);
     SubscriberNode *node = dispatcher.subscribers;
     while (node) {