fix: useEffect anti-patterns, attendance permissions, and received-invoices schema mismatch

- Remove ref-mirror useEffect in AuthContext (cachedUserRef already written at mutation sites)
- Replace useEffect slide direction in ReceivedInvoices with render-time computation
- Fix Login.tsx useEffect dependency array (mount-only alert should have [] deps)
- Move "project created" alert to navigation source in ProjectCreate, remove useEffect in ProjectDetail
- Move companySettings defaults into fetch callbacks in InvoiceDetail and OfferDetail
- Replace due_date useEffect with useMemo in InvoiceDetail
- Capture initial snapshots from API data instead of useEffect in InvoiceDetail, OfferDetail, OrderDetail
- Replace localStorage draft useEffect with lazy useState initializer in OfferDetail
- Fix attendance dropdown to filter by attendance.record permission only
- Fix clock-out 404 on update-address (remove departure_time filter for departure action)
- Fix received-invoices stats endpoint referencing non-existent is_deleted and amount_czk columns

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/admin/pages/OrderDetail.tsx

@@ -121,7 +121,6 @@ export default function OrderDetail() {
   const [showConfirmationModal, setShowConfirmationModal] = useState(false);
   const [confirmationLoading, setConfirmationLoading] = useState(false);
   const initialNotesRef = useRef<string | null>(null);
-  const hasSetInitialSnapshot = useRef(false);
   const blobTimeoutsRef = useRef<ReturnType<typeof setTimeout>[]>([]);
 
   useEffect(() => {
@@ -138,6 +137,7 @@ export default function OrderDetail() {
       if (result.success) {
         setOrder(result.data);
         setNotes(result.data.notes || "");
+        initialNotesRef.current = result.data.notes || "";
       } else {
         alert.error(result.error || "Nepodařilo se načíst objednávku");
         navigate("/orders");
@@ -154,17 +154,6 @@ export default function OrderDetail() {
     fetchDetail();
   }, [fetchDetail]);
 
-  useEffect(() => {
-    if (loading) {
-      hasSetInitialSnapshot.current = false;
-      return;
-    }
-    if (!hasSetInitialSnapshot.current) {
-      initialNotesRef.current = notes;
-      hasSetInitialSnapshot.current = true;
-    }
-  }, [loading, notes]);
-
   const isDirty = useMemo(() => {
     if (!initialNotesRef.current) return false;
     return notes !== initialNotesRef.current;