fix(dashboard): use GetFullStatus for backup display after restart

The dashboard was using GetStatus() which returns nil after restart,
showing "Még nem futott" even when backups exist. Now uses
GetFullStatus() with synthesis logic, matching the backups page.

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

controller/internal/web/handlers.go

@@ -56,10 +56,12 @@ func (s *Server) dashboardHandler(w http.ResponseWriter, _ *http.Request) {
 	// Backup status
 	data["BackupEnabled"] = s.cfg.Backup.Enabled
 	if s.backupMgr != nil {
-		dbDump, backupSt := s.backupMgr.GetStatus()
-		data["DBDumpStatus"] = dbDump
-		data["BackupStatus"] = backupSt
-		data["BackupRunning"] = s.backupMgr.IsRunning()
+		nextDBDump := scheduler.NextDailyRun(s.cfg.Backup.DBDumpSchedule)
+		nextBackup := scheduler.NextDailyRun(s.cfg.Backup.ResticSchedule)
+		fullStatus := s.backupMgr.GetFullStatus(nextDBDump, nextBackup)
+		data["DBDumpStatus"] = fullStatus.LastDBDump
+		data["BackupStatus"] = fullStatus.LastBackup
+		data["BackupRunning"] = fullStatus.Running
 		data["BackupMaxAgeHours"] = s.cfg.Monitoring.Thresholds.BackupMaxAgeHours
 	}