chore: clean up warnings from export optimization changes

- Remove unused finish_encoder_nv12 import
- Prefix unused cursor_events parameter with underscore
- Fix needless mutable on PendingNv12Readback::wait

Co-authored-by: Richie McIlroy <richiemcilroy@users.noreply.github.com>

Author: cursoragent

crates/rendering/src/frame_pipeline.rs

@@ -334,10 +334,7 @@ impl PendingNv12Readback {
         RenderingError::BufferMapWaitingFailed
     }
 
-    pub async fn wait(
-        mut self,
-        device: &wgpu::Device,
-    ) -> Result<Nv12RenderedFrame, RenderingError> {
+    pub async fn wait(self, device: &wgpu::Device) -> Result<Nv12RenderedFrame, RenderingError> {
         self.wait_with_pool(device, None).await
     }
 

crates/rendering/src/lib.rs

@@ -11,7 +11,7 @@ use cursor_interpolation::{
 };
 use decoder::{AsyncVideoDecoderHandle, spawn_decoder};
 use frame_pipeline::{
-    NV12BufferPool, RenderSession, finish_encoder, finish_encoder_nv12, finish_encoder_nv12_pooled,
+    NV12BufferPool, RenderSession, finish_encoder, finish_encoder_nv12_pooled,
     flush_pending_readback,
 };
 use futures::future::OptionFuture;
@@ -2171,7 +2171,7 @@ impl ProjectUniforms {
         frame_number: u32,
         fps: u32,
         resolution_base: XY<u32>,
-        cursor_events: &CursorEvents,
+        _cursor_events: &CursorEvents,
         segment_frames: &DecodedSegmentFrames,
         total_duration: f64,
         zoom_focus_interpolator: &ZoomFocusInterpolator,