feat: add session indicators and top exec commands to dashboard

Add visual indicators to session tables (replay badge when events exist,
exec badge for exec sessions) and a new "Top Exec Commands" table on the
dashboard. Includes EventCount field on Session, GetTopExecCommands on
Store interface, and truncateCommand template function.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

internal/web/handlers.go

@@ -9,13 +9,14 @@ import (
 )
 
 type dashboardData struct {
-	Stats          *storage.DashboardStats
-	TopUsernames   []storage.TopEntry
-	TopPasswords   []storage.TopEntry
-	TopIPs         []storage.TopEntry
-	TopCountries   []storage.TopEntry
-	ActiveSessions []storage.Session
-	RecentSessions []storage.Session
+	Stats           *storage.DashboardStats
+	TopUsernames    []storage.TopEntry
+	TopPasswords    []storage.TopEntry
+	TopIPs          []storage.TopEntry
+	TopCountries    []storage.TopEntry
+	TopExecCommands []storage.TopEntry
+	ActiveSessions  []storage.Session
+	RecentSessions  []storage.Session
 }
 
 func (s *Server) handleDashboard(w http.ResponseWriter, r *http.Request) {
@@ -56,6 +57,13 @@ func (s *Server) handleDashboard(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	topExecCommands, err := s.store.GetTopExecCommands(ctx, 10)
+	if err != nil {
+		s.logger.Error("failed to get top exec commands", "err", err)
+		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
+		return
+	}
+
 	activeSessions, err := s.store.GetRecentSessions(ctx, 50, true)
 	if err != nil {
 		s.logger.Error("failed to get active sessions", "err", err)
@@ -71,13 +79,14 @@ func (s *Server) handleDashboard(w http.ResponseWriter, r *http.Request) {
 	}
 
 	data := dashboardData{
-		Stats:          stats,
-		TopUsernames:   topUsernames,
-		TopPasswords:   topPasswords,
-		TopIPs:         topIPs,
-		TopCountries:   topCountries,
-		ActiveSessions: activeSessions,
-		RecentSessions: recentSessions,
+		Stats:           stats,
+		TopUsernames:    topUsernames,
+		TopPasswords:    topPasswords,
+		TopIPs:          topIPs,
+		TopCountries:    topCountries,
+		TopExecCommands: topExecCommands,
+		ActiveSessions:  activeSessions,
+		RecentSessions:  recentSessions,
 	}
 
 	w.Header().Set("Content-Type", "text/html; charset=utf-8")