[client] Tolerate already-deleted peer on profile logout, clear stale email

logoutFromProfile failed hard when the management server returned NotFound
(peer already deleted from the dashboard), blocking both profile logout and
profile removal. Treat NotFound as success — the peer is already gone, so
deregistering it is already satisfied.

Also drop the user-side per-profile state file on logout. The account email is
sourced from <profile>.state.json (written by the CLI after SSO login), which
the root daemon can't reach, so logout left a stale email showing in the UI.
Connection.Logout now removes it from the UI process after a successful logout;
the next SSO login recreates it.

client/internal/profilemanager/state.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"os"
 	"path/filepath"
 
 	"github.com/netbirdio/netbird/util"
@@ -59,3 +60,22 @@ func (pm *ProfileManager) SetActiveProfileState(state *ProfileState) error {
 
 	return nil
 }
+
+// RemoveProfileState deletes the per-profile state file (which holds the
+// account email used for the SSO login hint and the UI display). Called after
+// a successful logout so a logged-out profile no longer shows a stale account
+// email. The state file only stores the email, so deleting it is equivalent to
+// clearing it; the next SSO login recreates it. A missing file is not an error.
+func (pm *ProfileManager) RemoveProfileState(profileName string) error {
+	configDir, err := getConfigDir()
+	if err != nil {
+		return fmt.Errorf("get config directory: %w", err)
+	}
+
+	stateFile := filepath.Join(configDir, profileName+".state.json")
+	if err := os.Remove(stateFile); err != nil && !os.IsNotExist(err) {
+		return fmt.Errorf("remove profile state: %w", err)
+	}
+
+	return nil
+}

client/server/server.go

@@ -1210,7 +1210,19 @@ func (s *Server) sendLogoutRequestWithConfig(ctx context.Context, config *profil
 		}
 	}()
 
-	return mgmClient.Logout()
+	if err := mgmClient.Logout(); err != nil {
+		// The peer is already gone from the management server (e.g. deleted
+		// from the dashboard). The logout's goal — deregistering this peer —
+		// is therefore already satisfied, so treat NotFound as success rather
+		// than blocking the logout/profile-removal flow.
+		if logoutPeerGone(err) {
+			log.Infof("peer already removed from management server, treating logout as successful")
+			return nil
+		}
+		return err
+	}
+
+	return nil
 }
 
 // Status returns the daemon status
@@ -2117,3 +2129,15 @@ func persistLoginOverrides(activeProf *profilemanager.ActiveProfileState, manage
 	}
 	return nil
 }
+
+// logoutPeerGone reports whether a management Logout failed because the peer
+// no longer exists server-side (gRPC NotFound), walking the wrap chain since
+// the client wraps the gRPC status with fmt.Errorf.
+func logoutPeerGone(err error) bool {
+	for e := err; e != nil; e = errors.Unwrap(e) {
+		if s, ok := gstatus.FromError(e); ok && s.Code() == codes.NotFound {
+			return true
+		}
+	}
+	return false
+}

client/ui/services/connection.go

@@ -12,8 +12,10 @@ import (
 	"runtime"
 	"strings"
 
+	log "github.com/sirupsen/logrus"
 	gstatus "google.golang.org/grpc/status"
 
+	"github.com/netbirdio/netbird/client/internal/profilemanager"
 	"github.com/netbirdio/netbird/client/proto"
 	"github.com/netbirdio/netbird/client/ui/i18n"
 	"github.com/netbirdio/netbird/client/ui/preferences"
@@ -339,5 +341,17 @@ func (s *Connection) Logout(ctx context.Context, p LogoutParams) error {
 	if _, err = cli.Logout(ctx, req); err != nil {
 		return s.classifyDaemonError(err)
 	}
+
+	// The daemon runs as root and can't reach the user-owned per-profile state
+	// file that holds the account email (see Profiles.List). Drop it here from
+	// the UI process so a logged-out profile no longer shows a stale email; the
+	// next SSO login recreates it.
+	if p.ProfileName != "" {
+		if err := profilemanager.NewProfileManager().RemoveProfileState(p.ProfileName); err != nil {
+			// Non-fatal: the logout itself succeeded.
+			log.Warnf("failed to remove profile state for %s: %v", p.ProfileName, err)
+		}
+	}
+
 	return nil
 }