Revízny systém - kompletná implementácia

- Backend: CRUD revízií, schedule endpoint (agregovaný plán), skip revízia, stats
- Shared utility revisionSchedule.ts - centralizovaná logika výpočtu cyklov
- Equipment detail s revíznym plánom, históriou a prílohami
- Frontend: RevisionsList s tabmi (nadchádzajúce/po termíne/vykonané/preskočené)
- Pozičné labeling cyklov (eliminuje drift 4×90≠365)
- EquipmentRevisionSchedule model (many-to-many typy revízií)
- Aktualizovaná dokumentácia HELPDESK_INIT_V2.md

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

frontend/src/hooks/useRevisionStatus.ts

@@ -0,0 +1,102 @@
+import { useQuery } from '@tanstack/react-query';
+import { settingsApi } from '@/services/settings.api';
+import { AlertTriangle, Clock, CheckCircle, SkipForward, type LucideIcon } from 'lucide-react';
+
+export interface RevisionThreshold {
+  days: number;
+  label: string;
+  color: string;
+}
+
+const DEFAULT_THRESHOLDS: RevisionThreshold[] = [
+  { days: 30, label: 'Blíži sa', color: '#EAB308' },
+  { days: 14, label: 'Blíži sa!', color: '#F97316' },
+  { days: 7, label: 'Urgentné!', color: '#EF4444' },
+];
+
+const OVERDUE_COLOR = '#DC2626';
+const OK_COLOR = '#22C55E';
+const SKIP_COLOR = '#9CA3AF';
+
+export type RevisionContext = 'schedule' | 'performed' | 'skipped';
+
+export interface RevisionStatusResult {
+  label: string;
+  color: string | null;
+  icon: LucideIcon | null;
+  variant: 'default' | 'secondary' | 'destructive' | 'outline';
+}
+
+export function useRevisionStatus() {
+  const { data: settingData } = useQuery({
+    queryKey: ['system-setting', 'REVISION_STATUS_THRESHOLDS'],
+    queryFn: () => settingsApi.getSystemSetting('REVISION_STATUS_THRESHOLDS'),
+    staleTime: 5 * 60 * 1000,
+  });
+
+  const thresholds: RevisionThreshold[] = Array.isArray(settingData?.data?.value)
+    ? (settingData.data.value as RevisionThreshold[])
+    : DEFAULT_THRESHOLDS;
+
+  // Zoradiť vzostupne podľa dní
+  const sorted = [...thresholds].sort((a, b) => a.days - b.days);
+
+  function getStatus(nextDueDate?: string | null, context?: RevisionContext | boolean): RevisionStatusResult {
+    // Spätná kompatibilita: boolean → context
+    let ctx: RevisionContext;
+    if (typeof context === 'boolean') {
+      ctx = context ? 'schedule' : 'performed';
+    } else {
+      ctx = context || 'schedule';
+    }
+
+    if (ctx === 'performed') {
+      return { label: 'Vykonaná', color: OK_COLOR, icon: CheckCircle, variant: 'secondary' };
+    }
+
+    if (ctx === 'skipped') {
+      return { label: 'Vynechaná', color: SKIP_COLOR, icon: SkipForward, variant: 'secondary' };
+    }
+
+    // context === 'schedule' → countdown logika
+    if (!nextDueDate) {
+      return { label: '-', color: null, icon: null, variant: 'secondary' };
+    }
+
+    const now = new Date();
+    const due = new Date(nextDueDate);
+    const diffDays = Math.ceil((due.getTime() - now.getTime()) / (1000 * 60 * 60 * 24));
+
+    // Po termíne
+    if (diffDays < 0) {
+      return {
+        label: `Po termíne (${Math.abs(diffDays)} dní)`,
+        color: OVERDUE_COLOR,
+        icon: AlertTriangle,
+        variant: 'destructive',
+      };
+    }
+
+    // Nájsť prvý prah kde diffDays <= threshold.days
+    for (const threshold of sorted) {
+      if (diffDays <= threshold.days) {
+        return {
+          label: `${threshold.label} (${diffDays} dní)`,
+          color: threshold.color,
+          icon: Clock,
+          variant: 'default',
+        };
+      }
+    }
+
+    // V poriadku - ďaleko od termínu
+    return {
+      label: `Za ${diffDays} dní`,
+      color: OK_COLOR,
+      icon: CheckCircle,
+      variant: 'default',
+    };
+  }
+
+  return { getStatus, thresholds };
+}