Playtime stats between players only; no ping; page-wide grid

K/D, headshot %, kills and deaths (drawer, Top players, staff session
lists) now come from pt_events, so kills of bots and deaths to bots don't
count, as in Records; damage per round and MVPs are gone, since only the
game's counters have them and those include bots. Average ping and the
record count footnote are no longer shown. The server header's grid now
runs behind the whole page.

internal/web/playtime.go

@@ -359,7 +359,7 @@ func (s *Server) playerPlaytime(r *http.Request, steamid string, staff bool) map
 	}
 	out := map[string]any{"player": p}
 	if staff {
-		extra, err := s.pt.PlayerStaff(ctx, n, now)
+		extra, err := s.pt.PlayerStaff(ctx, n)
 		if err != nil {
 			slog.Warn("staff playtime for a player", "steamid", steamid, "err", err)
 			return out