fix: use correct nih-plug API to access channel samples

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

src/lib.rs

@@ -102,8 +102,9 @@ impl Plugin for ClipLauncher {
         }
 
         // Process audio
-        for channel_samples in buffer.iter_samples() {
-            let (input, output): (&[f32], &mut [f32]) = channel_samples.into();
+        for channel in buffer.channels() {
+            let input = channel.inputs;
+            let output = channel.outputs;
             let num_samples = input.len();
             
             // Process this block