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/ReceivedInvoices.tsx

@@ -192,18 +192,14 @@ export default function ReceivedInvoices({
     };
   }, []);
 
-  useEffect(() => {
-    const prev = prevYear.current * 12 + prevMonth.current;
-    const curr = statsYear * 12 + statsMonth;
-    if (curr > prev) {
-      slideDirection.current = 1;
-    }
-    if (curr < prev) {
-      slideDirection.current = -1;
-    }
-    prevMonth.current = statsMonth;
-    prevYear.current = statsYear;
-  }, [statsMonth, statsYear]);
+  // Compute slide direction during render (not in effect) so it's
+  // available for the current frame instead of one render late.
+  const prevTotal = prevYear.current * 12 + prevMonth.current;
+  const currTotal = statsYear * 12 + statsMonth;
+  if (currTotal > prevTotal) slideDirection.current = 1;
+  else if (currTotal < prevTotal) slideDirection.current = -1;
+  prevMonth.current = statsMonth;
+  prevYear.current = statsYear;
 
   const fetchList = useCallback(async () => {
     if (!hasLoadedOnce.current) setLoading(true);