Fix overflow, diagram zoom, task-switch stall and other QA findings

internal/server/server.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"log/slog"
 	"net/http"
+	"net/url"
 	"os"
 	"path/filepath"
 	"strings"
@@ -202,11 +203,19 @@ func (s *Server) identify(next http.Handler) http.Handler {
 }
 
 func (s *Server) acted(login string, r *http.Request) {
-	if s.clients.Acted(r.Header.Get("Byre-Client"), login, r.Header.Get("Byre-Host"), r.Header.Get("Byre-Commit"), r.Header.Get("Byre-Build")) {
+	if s.clients.Acted(r.Header.Get("Byre-Client"), login, clientHost(r), r.Header.Get("Byre-Commit"), r.Header.Get("Byre-Build")) {
 		s.clientsChanged()
 	}
 }
 
+func clientHost(r *http.Request) string {
+	host, err := url.PathUnescape(r.Header.Get("Byre-Host"))
+	if err != nil {
+		return ""
+	}
+	return host
+}
+
 func (s *Server) connectedClients() []api.ConnectedClient {
 	out := []api.ConnectedClient{}
 	for _, c := range s.clients.List() {