style(host): cargo fmt --all (rustfmt 1.9.0 drift)

The CI image's rustfmt reformats these files (multi-line assert!/tracing! macros,
match-arm and struct-variant wrapping) — pre-existing drift that the Format job caught.
Reformat to match. Pure formatting; no logic change. main.rs also gets a blank line
before a standalone comment so rustfmt stops mis-indenting it as a trailing-comment
continuation.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

crates/punktfunk-host/src/gamestream/apps.rs

@@ -274,7 +274,10 @@ mod tests {
         );
         // No pretty-print newlines anywhere in the element stream, and no whitespace-only text
         // nodes between any adjacent tags.
-        assert!(!xml.contains('\n'), "applist must contain no newlines: {xml}");
+        assert!(
+            !xml.contains('\n'),
+            "applist must contain no newlines: {xml}"
+        );
         assert!(
             !xml.contains("> <"),
             "applist must contain no inter-element spaces: {xml}"

crates/punktfunk-host/src/gamestream/nvhttp.rs

@@ -132,9 +132,9 @@ async fn h_launch(
         return xml(error_xml()).into_response();
     }
     let req_fp: Option<[u8; 32]> = match &peer {
-        Some(Extension(PeerCertFingerprint(Some(fp)))) => {
-            hex::decode(fp).ok().and_then(|v| <[u8; 32]>::try_from(v).ok())
-        }
+        Some(Extension(PeerCertFingerprint(Some(fp)))) => hex::decode(fp)
+            .ok()
+            .and_then(|v| <[u8; 32]>::try_from(v).ok()),
         _ => None,
     };
 
@@ -156,7 +156,9 @@ async fn h_launch(
             GsDecision::Serve => {}
             GsDecision::Join((w, h, f)) => {
                 forced_mode = Some((w, h, f));
-                tracing::info!("GameStream launch JOIN — admitting at the live session's mode {w}x{h}@{f}");
+                tracing::info!(
+                    "GameStream launch JOIN — admitting at the live session's mode {w}x{h}@{f}"
+                );
             }
             GsDecision::Reject => {
                 tracing::warn!(

crates/punktfunk-host/src/gamestream/stream.rs

@@ -816,7 +816,10 @@ fn stream_body(
                     dropped_batches += 1;
                     recover_after_drop = true; // re-anchor the reference chain on the next frame
                     if dropped_batches.is_power_of_two() {
-                        tracing::warn!(dropped_batches, "video: pipeline queue full — frame dropped");
+                        tracing::warn!(
+                            dropped_batches,
+                            "video: pipeline queue full — frame dropped"
+                        );
                     }
                 }
                 Err(std::sync::mpsc::TrySendError::Disconnected(_)) => {
@@ -1019,8 +1022,14 @@ mod tests {
             let (chunk, steps) = pace_layout(n);
             assert!(steps >= 1, "n={n}: at least one step");
             assert!(steps <= 12, "n={n}: step count {steps} exceeded the cap");
-            assert!(chunk >= 16, "n={n}: chunk {chunk} below the 16-packet floor");
-            assert!(chunk * steps >= n, "n={n}: {chunk}×{steps} must cover all packets");
+            assert!(
+                chunk >= 16,
+                "n={n}: chunk {chunk} below the 16-packet floor"
+            );
+            assert!(
+                chunk * steps >= n,
+                "n={n}: {chunk}×{steps} must cover all packets"
+            );
         }
         // Small frames stay on the floor: one 16-packet burst.
         assert_eq!(pace_layout(1), (16, 1));