style: apply current rustfmt to the tree

A newer rustfmt wraps over-long match arms and call expressions that the
version main was last formatted with left on one line. Pure formatting,
no semantic change — split out so the friends-list feature commits stay
focused on real changes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/host/mod.rs

@@ -256,7 +256,9 @@ fn spawn_kick_listener(sup_tx: mpsc::Sender<SupervisorMsg>) {
             let Some(id) = line.trim().strip_prefix("kick ") else {
                 continue;
             };
-            let msg = SupervisorMsg::KickViewer { id: id.trim().to_string() };
+            let msg = SupervisorMsg::KickViewer {
+                id: id.trim().to_string(),
+            };
             // blocking_send is valid here: this is a plain thread, not inside
             // the tokio runtime. An Err means the supervisor closed — stop.
             if sup_tx.blocking_send(msg).is_err() {
@@ -315,7 +317,11 @@ async fn supervise(
                 viewers.insert(id.clone(), cancel);
                 let active = viewers.len() as u32;
                 let _ = reply.send(Ok(port));
-                output::emit(output::Event::ViewerJoined { id: &id, active, max: max_viewers });
+                output::emit(output::Event::ViewerJoined {
+                    id: &id,
+                    active,
+                    max: max_viewers,
+                });
                 tracing::info!(active, cap = max_viewers, "viewer joined");
             }
             SupervisorMsg::RemoveViewer { id } => {
@@ -325,7 +331,11 @@ async fn supervise(
                     continue;
                 }
                 let active = viewers.len() as u32;
-                output::emit(output::Event::ViewerLeft { id: &id, active, max: max_viewers });
+                output::emit(output::Event::ViewerLeft {
+                    id: &id,
+                    active,
+                    max: max_viewers,
+                });
                 tracing::info!(active, cap = max_viewers, "viewer left");
                 if active == 0
                     && let Some(h) = handle.take()
@@ -372,10 +382,25 @@ fn print_host_banner(
     eprintln!("┌─ PixelPass · host ─────────────────────────────────────────");
     eprintln!("│  display server : {display:?}");
     eprintln!("│  capture        : {}", capture_summary(opts));
-    eprintln!("│  quality        : {} — {}", quality.label, quality.dimensions_summary());
+    eprintln!(
+        "│  quality        : {} — {}",
+        quality.label,
+        quality.dimensions_summary()
+    );
     eprintln!("│                   ({})", quality.note);
-    eprintln!("│  hw encode      : {}", if opts.no_hwencode { "off (software x264)" } else { "on (VAAPI H.264)" });
-    eprintln!("│  max viewers    : {} ({})", resolution.value, resolution.source.label());
+    eprintln!(
+        "│  hw encode      : {}",
+        if opts.no_hwencode {
+            "off (software x264)"
+        } else {
+            "on (VAAPI H.264)"
+        }
+    );
+    eprintln!(
+        "│  max viewers    : {} ({})",
+        resolution.value,
+        resolution.source.label()
+    );
     eprintln!("│");
     if clipboard_ok {
         eprintln!("│  Your share code has been copied to your clipboard.");
@@ -439,7 +464,9 @@ fn resolve_max_viewers(opts: &HostOpts, effective_bitrate: u32) -> MaxViewersRes
         let n = bandwidth::recommended_max_viewers(upstream, effective_bitrate);
         return MaxViewersResolution {
             value: n,
-            source: MaxViewersSource::BandwidthMeasurement { safe_mbps: upstream },
+            source: MaxViewersSource::BandwidthMeasurement {
+                safe_mbps: upstream,
+            },
         };
     }
     MaxViewersResolution {