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/ProjectDetail.tsx

@@ -1,7 +1,7 @@
 import { useState, useEffect, useRef } from "react";
 import { useAlert } from "../context/AlertContext";
 import { useAuth } from "../context/AuthContext";
-import { useParams, useNavigate, useLocation, Link } from "react-router-dom";
+import { useParams, useNavigate, Link } from "react-router-dom";
 import { motion } from "framer-motion";
 
 import Forbidden from "../components/Forbidden";
@@ -73,7 +73,6 @@ export default function ProjectDetail() {
   const alert = useAlert();
   const { hasPermission, isAdmin } = useAuth();
   const navigate = useNavigate();
-  const location = useLocation();
 
   const [loading, setLoading] = useState(true);
   const [saving, setSaving] = useState(false);
@@ -98,18 +97,6 @@ export default function ProjectDetail() {
   const [addingNote, setAddingNote] = useState(false);
   const [deletingNoteId, setDeletingNoteId] = useState<number | null>(null);
 
-  const createdShown = useRef(false);
-  useEffect(() => {
-    if (
-      (location.state as { created?: boolean })?.created &&
-      !createdShown.current
-    ) {
-      createdShown.current = true;
-      alert.success("Projekt byl vytvořen");
-      navigate(location.pathname, { replace: true, state: {} });
-    }
-  }, [location.state, location.pathname, alert, navigate]);
-
   const fetchNotes = async () => {
     try {
       const response = await apiFetch(`${API_BASE}/projects/${id}`);