style: apply rustfmt to establish clean baseline before refactor

Pre-refactor baseline state:
- 79 lib tests + 3 integration tests pass (1 integration test #[ignore])
- cargo clippy --all-targets -- -D warnings clean
- cargo build --release clean

No semantic changes; only rustfmt drift correction across 6 files.

src/state.rs

@@ -90,7 +90,6 @@ pub struct PartialOutputInfo {
     pub done_count: u32,
 }
 
-
 /// Marker for wlr-output-management heads seen during probing; tracked by name
 /// in `EncConstructionStage::ProbingOutputs.wlr_heads`.
 // `pub(crate)` (not module-private): exposed via `EncConstructionStage::ProbingOutputs.wlr_heads`
@@ -121,7 +120,10 @@ impl StreamingEncoder {
         }
     }
 
-    fn encode_frame(&mut self, hw_frame: &ffmpeg_next::frame::Video) -> anyhow::Result<crate::avhw::EncodeStages> {
+    fn encode_frame(
+        &mut self,
+        hw_frame: &ffmpeg_next::frame::Video,
+    ) -> anyhow::Result<crate::avhw::EncodeStages> {
         match self {
             StreamingEncoder::Mp4(enc) => enc.encode_frame(hw_frame),
             StreamingEncoder::WebRtc(enc) => enc.encode_frame(hw_frame),
@@ -704,9 +706,7 @@ impl<S: CaptureSource> State<S> {
                     continue;
                 }
                 count += 1;
-                if let Err(e) = wrtc
-                    .write_h264_frame(&enc_frame.data, enc_frame.pts_ticks)
-                {
+                if let Err(e) = wrtc.write_h264_frame(&enc_frame.data, enc_frame.pts_ticks) {
                     tracing::debug!("WebRTC write frame error: {e}");
                 }
                 self.stats.record_send(0.0, None);
@@ -881,7 +881,8 @@ impl<S: CaptureSource> State<S> {
                             }
                         } else {
                             // done_count >= 1 implies transform arrived (Geometry precedes Done).
-                            if info.done_count < 1 || !wlr_manager_done || info.transform.is_none() {
+                            if info.done_count < 1 || !wlr_manager_done || info.transform.is_none()
+                            {
                                 return false;
                             }
                         }
@@ -1154,10 +1155,7 @@ impl<S: CaptureSource> Dispatch<WlOutput, OutputId> for State<S> {
         };
 
         match event {
-            OutputEvent::Geometry {
-                transform,
-                ..
-            } => {
+            OutputEvent::Geometry { transform, .. } => {
                 let t = match transform {
                     wayland_client::WEnum::Value(WlTransform::Normal) => Transform::Normal,
                     wayland_client::WEnum::Value(WlTransform::_90) => Transform::Normal90,
@@ -1527,9 +1525,7 @@ impl<S: CaptureSource> Dispatch<ZwlrOutputHeadV1, ()> for State<S> {
                     ..
                 } = &mut state.stage
                 {
-                    wlr_heads
-                        .entry(name.clone())
-                        .or_insert(WlrHeadInfo {});
+                    wlr_heads.entry(name.clone()).or_insert(WlrHeadInfo {});
                     wlr_head_proxy_to_name.insert(proxy.id(), name);
                 }
             }