fix(serve): continue past transient accept errors

Previously a single EMFILE / EINTR on listener.accept() returned from
run_accept_loop entirely, killing the host's HTTP viewer fanout for the
rest of the session. Most accept errors are transient — log and loop.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/host/serve.rs

@@ -130,8 +130,11 @@ async fn run_accept_loop(listener: TcpListener, tx: broadcast::Sender<Arc<Vec<u8
         let sock = match listener.accept().await {
             Ok((s, _)) => s,
             Err(e) => {
-                tracing::warn!("capture HTTP accept failed: {e}");
-                return;
+                // Most accept errors are transient (EMFILE from a brief FD spike,
+                // EINTR, etc.). Bailing on the first one would kill the entire
+                // viewer fanout for the rest of the session.
+                tracing::warn!("capture HTTP accept failed (continuing): {e}");
+                continue;
             }
         };
         let rx = tx.subscribe();