[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/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
 }