fix: increase sleep duration in WAV load test to ensure control key processing

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

tests/integration.c

@@ -969,7 +969,7 @@ static int test_wav_load(void) {
         kill(pid, SIGTERM); waitpid(pid, NULL, 0);
         unlink("loop.wav"); return 1;
     }
-    safe_usleep(200000);
+    safe_usleep(1000000);  /* 1 second to ensure control key is processed */
     if (send_jack_note_on("looper:control", 70, 127) != 0) {
         jack_deactivate(client);
         jack_client_close(client);