chore: initialize samples array to write to later in render

src/command/render.rs

@@ -287,6 +287,13 @@ pub async fn handle(state: State, interaction: Interaction) {
     let duration = end - start;
     tracing::info!(?voice_channel_id, ?start, ?end, ?duration);
 
+    let sample_rate = u32::from(state.audio_sample_rate);
+
+    let total_samples = (duration.whole_seconds() as u32 * sample_rate)
+        + (duration.subsec_microseconds() as u32 * sample_rate / 1_000_000);
+
+    let samples = vec![0; total_samples as usize];
+
     let mut recordings =
         state
             .recording_data_manager