feat: úhrada za všechny jednou osobou (issue #29, SINGLE_PAYMENT)

Přidává možnost, aby jeden strávník zaplatil celý účet v restauraci a ostatní
obdrželi QR kód pro refundaci.

Prerekvizita — podpora více QR kódů na (příjemce, den):
- PendingQr.id (UUID) nahrazuje deduplikaci podle data; každý QR má vlastní klíč
- QR obrázky uloženy do Redis/storage (base64) místo tmpdir — přežijí redeploy
- GET /api/qr vyžaduje ?id= parametr; dismissQr přijímá {id} místo {date}

Feature:
- Ikona 'Zaplatit za všechny' v choices-table pro každou LunchChoice (kromě
  PIZZA/NEOBEDVAM/ROZHODUJI); viditelná jen při ≥2 strávnících a vyplněném účtu
- PayForAllModal: tabulka strávníků s prefillovanými cenami z menu, příplatky
  per-diner, celkové dýško rozpočtené rovnoměrně, generování QR přes POST /api/qr/generate
- parsePriceCzk() helper pro parsing 'N Kč' → number

Co se nemění: POST /api/qr/generate API kontrakt, PizzaOrder.hasQr boolean

Co se mění v OpenAPI: PendingQr.id (required), getPizzaQr ?id param, dismissQr body

Co-Authored-By: opmrdkazkrtkaus <opmrdkazkrtkaus@melancholik.eu>

client/src/App.tsx

@@ -13,12 +13,13 @@ import './App.scss';
 import { faCircleCheck, faNoteSticky, faTrashCan, faComment } from '@fortawesome/free-regular-svg-icons';
 import { useSettings } from './context/settings';
 import Footer from './components/Footer';
-import { faBasketShopping, faChainBroken, faChevronLeft, faChevronRight, faGear, faSatelliteDish, faSearch, faTriangleExclamation } from '@fortawesome/free-solid-svg-icons';
+import { faBasketShopping, faChainBroken, faChevronLeft, faChevronRight, faGear, faMoneyBillTransfer, faSatelliteDish, faSearch, faTriangleExclamation } from '@fortawesome/free-solid-svg-icons';
 import Loader from './components/Loader';
 import { getHumanDateTime, isInTheFuture, formatDateString } from './Utils';
 import NoteModal from './components/modals/NoteModal';
+import PayForAllModal from './components/modals/PayForAllModal';
 import { useEasterEgg } from './context/eggs';
-import { ClientData, Food, PizzaOrder, DepartureTime, PizzaDayState, Restaurant, RestaurantDayMenu, RestaurantDayMenuMap, LunchChoice, UserLunchChoice, PizzaVariant, getData, getEasterEggImage, addPizza, removePizza, updatePizzaDayNote, createPizzaDay, deletePizzaDay, lockPizzaDay, unlockPizzaDay, finishOrder, finishDelivery, addChoice, jdemeObed, removeChoices, removeChoice, updateNote, changeDepartureTime, setBuyer, dismissQr } from '../../types';
+import { ClientData, Food, PizzaOrder, DepartureTime, PizzaDayState, Restaurant, RestaurantDayMenu, RestaurantDayMenuMap, LunchChoice, LocationLunchChoicesMap, UserLunchChoice, PizzaVariant, getData, getEasterEggImage, addPizza, removePizza, updatePizzaDayNote, createPizzaDay, deletePizzaDay, lockPizzaDay, unlockPizzaDay, finishOrder, finishDelivery, addChoice, jdemeObed, removeChoices, removeChoice, updateNote, changeDepartureTime, setBuyer, dismissQr, generateQr } from '../../types';
 import { getLunchChoiceName } from './enums';
 // import FallingLeaves, { LEAF_PRESETS, LEAF_COLOR_THEMES } from './FallingLeaves';
 // import './FallingLeaves.scss';
@@ -74,6 +75,7 @@ function App() {
   const [dayIndex, setDayIndex] = useState<number>();
   const [loadingPizzaDay, setLoadingPizzaDay] = useState<boolean>(false);
   const [noteModalOpen, setNoteModalOpen] = useState<boolean>(false);
+  const [payForAllLocationKey, setPayForAllLocationKey] = useState<LunchChoice | null>(null);
   const [eggImage, setEggImage] = useState<Blob>();
   const eggRef = useRef<HTMLImageElement>(null);
   // Prazvláštní workaround, aby socket.io listener viděl aktuální hodnotu
@@ -679,6 +681,18 @@ function App() {
                           <td>
                             {locationName}
                             {(locationPickCount ?? 0) > 1 && <span className="ms-1">({locationPickCount})</span>}
+                            {locationPickCount >= 2 && auth.login && loginObject[auth.login] !== undefined
+                              && locationKey !== LunchChoice.PIZZA && locationKey !== LunchChoice.NEOBEDVAM && locationKey !== LunchChoice.ROZHODUJI
+                              && settings?.bankAccount && settings?.holderName && (
+                              <span title='Zaplatit za všechny a vygenerovat QR kódy ostatním' className="ms-2">
+                                <FontAwesomeIcon
+                                  icon={faMoneyBillTransfer}
+                                  onClick={() => setPayForAllLocationKey(locationKey)}
+                                  className='action-icon'
+                                  style={{ cursor: 'pointer' }}
+                                />
+                              </span>
+                            )}
                           </td>
                           <td className='p-0'>
                             <Table className="nested-table">
@@ -856,11 +870,15 @@ function App() {
                     }
                     <PizzaOrderList state={data.pizzaDay.state!} orders={data.pizzaDay.orders!} onDelete={handlePizzaDelete} creator={data.pizzaDay.creator!} />
                     {
-                      data.pizzaDay.state === PizzaDayState.DELIVERED && myOrder?.hasQr &&
-                      <div className='qr-code'>
-                        <h3>QR platba</h3>
-                        <img src={`/api/qr?login=${auth.login}`} alt='QR kód' />
-                      </div>
+                      data.pizzaDay.state === PizzaDayState.DELIVERED && myOrder?.hasQr && (() => {
+                        const pizzaQr = data.pendingQrs?.find(qr => qr.creator === data.pizzaDay?.creator);
+                        return pizzaQr ? (
+                          <div className='qr-code'>
+                            <h3>QR platba</h3>
+                            <img src={`/api/qr?login=${auth.login}&id=${pizzaQr.id}`} alt='QR kód' />
+                          </div>
+                        ) : null;
+                      })()
                     }
                   </>
                 }
@@ -870,18 +888,17 @@ function App() {
           {data.pendingQrs && data.pendingQrs.length > 0 &&
             <div className='pizza-section fade-in mt-4'>
               <h3>Nevyřízené platby</h3>
-              <p>Máte neuhrazené platby z předchozích dní.</p>
+              <p>Máte neuhrazené platby.</p>
               {data.pendingQrs.map(qr => (
-                <div key={qr.date} className='qr-code mb-3'>
+                <div key={qr.id} className='qr-code mb-3'>
                   <p>
                     <strong>{formatDateString(qr.date)}</strong> — {qr.creator} ({qr.totalPrice} Kč)
                     {qr.purpose && <><br /><span className="text-muted">{qr.purpose}</span></>}
                   </p>
-                  <img src={`/api/qr?login=${auth.login}`} alt='QR kód' />
+                  <img src={`/api/qr?login=${auth.login}&id=${qr.id}`} alt='QR kód' />
                   <div className='mt-2'>
                     <Button variant="success" onClick={async () => {
-                      await dismissQr({ body: { date: qr.date } });
-                      // Přenačteme data pro aktualizaci
+                      await dismissQr({ body: { id: qr.id } });
                       const response = await getData({ query: { dayIndex } });
                       if (response.data) {
                         setData(response.data);
@@ -902,6 +919,19 @@ function App() {
       /> */}
       <Footer />
       <NoteModal isOpen={noteModalOpen} onClose={() => setNoteModalOpen(false)} onSave={saveNote} />
+      {payForAllLocationKey && data && (
+        <PayForAllModal
+          isOpen
+          onClose={() => setPayForAllLocationKey(null)}
+          locationKey={payForAllLocationKey}
+          locationName={getLunchChoiceName(payForAllLocationKey)}
+          locationChoices={data.choices[payForAllLocationKey as keyof typeof data.choices] as LocationLunchChoicesMap}
+          menu={food?.[payForAllLocationKey as Restaurant]}
+          payerLogin={auth.login ?? ''}
+          bankAccount={settings?.bankAccount ?? ''}
+          bankAccountHolder={settings?.holderName ?? ''}
+        />
+      )}
     </div>
   );
 }

client/src/components/modals/PayForAllModal.tsx

@@ -0,0 +1,308 @@
+import { useState, useEffect, useCallback } from "react";
+import { Modal, Button, Form, Table, Alert } from "react-bootstrap";
+import { generateQr, LunchChoice, LocationLunchChoicesMap, RestaurantDayMenu, QrRecipient } from "../../../../types";
+import { parsePriceCzk } from "../../utils/parsePrice";
+
+type DinerEntry = {
+    login: string;
+    selectedFoods: number[];
+    baseAmount: number;
+    baseAmountParseFailed: boolean;
+    surchargeText: string;
+    surchargeAmount: string;
+    included: boolean;
+};
+
+type Props = {
+    isOpen: boolean;
+    onClose: () => void;
+    locationKey: LunchChoice;
+    locationName: string;
+    locationChoices: LocationLunchChoicesMap;
+    menu: RestaurantDayMenu | undefined;
+    payerLogin: string;
+    bankAccount: string;
+    bankAccountHolder: string;
+};
+
+function sanitizeAmount(value: string): string {
+    return value.replace(/[^0-9.,]/g, '').replace(',', '.');
+}
+
+function parseAmount(s: string): number | null {
+    if (!s || s.trim().length === 0) return null;
+    const n = parseFloat(s);
+    if (isNaN(n) || n < 0) return null;
+    const parts = s.split('.');
+    if (parts.length === 2 && parts[1].length > 2) return null;
+    return Math.round(n * 100) / 100;
+}
+
+export default function PayForAllModal({ isOpen, onClose, locationName, locationChoices, menu, payerLogin, bankAccount, bankAccountHolder }: Readonly<Props>) {
+    const [diners, setDiners] = useState<DinerEntry[]>([]);
+    const [tipTotal, setTipTotal] = useState('');
+    const [error, setError] = useState<string | null>(null);
+    const [loading, setLoading] = useState(false);
+    const [success, setSuccess] = useState(false);
+
+    const hasMenu = !!menu;
+
+    useEffect(() => {
+        if (!isOpen) return;
+        const entries: DinerEntry[] = Object.entries(locationChoices).map(([login, choice]) => {
+            const selectedFoods = choice.selectedFoods ?? [];
+            let baseAmount = 0;
+            let baseAmountParseFailed = false;
+            if (menu) {
+                for (const idx of selectedFoods) {
+                    const price = parsePriceCzk(menu.food?.[idx]?.price);
+                    if (price === null) {
+                        baseAmountParseFailed = true;
+                    } else {
+                        baseAmount += price;
+                    }
+                }
+            }
+            return {
+                login,
+                selectedFoods,
+                baseAmount,
+                baseAmountParseFailed,
+                surchargeText: '',
+                surchargeAmount: '',
+                included: login !== payerLogin,
+            };
+        });
+        setDiners(entries);
+        setTipTotal('');
+        setError(null);
+        setSuccess(false);
+    }, [isOpen, locationChoices, menu, payerLogin]);
+
+    const includedDiners = diners.filter(d => d.included && d.login !== payerLogin);
+    const tipPerPerson = (() => {
+        if (includedDiners.length === 0) return 0;
+        const tip = parseAmount(tipTotal);
+        if (tip === null || tip === 0) return 0;
+        return Math.round((tip / includedDiners.length) * 100) / 100;
+    })();
+
+    const getTotal = (d: DinerEntry): number => {
+        const surcharge = parseAmount(d.surchargeAmount) ?? 0;
+        const tip = d.included && d.login !== payerLogin ? tipPerPerson : 0;
+        return Math.round((d.baseAmount + surcharge + tip) * 100) / 100;
+    };
+
+    const handleInclude = useCallback((login: string, checked: boolean) => {
+        setDiners(prev => prev.map(d => d.login === login ? { ...d, included: checked } : d));
+    }, []);
+
+    const handleSurchargeText = useCallback((login: string, value: string) => {
+        setDiners(prev => prev.map(d => d.login === login ? { ...d, surchargeText: value } : d));
+    }, []);
+
+    const handleSurchargeAmount = useCallback((login: string, value: string) => {
+        setDiners(prev => prev.map(d => d.login === login ? { ...d, surchargeAmount: sanitizeAmount(value) } : d));
+    }, []);
+
+    const handleGenerate = async () => {
+        setError(null);
+        const recipients: QrRecipient[] = [];
+
+        for (const d of diners) {
+            if (!d.included || d.login === payerLogin) continue;
+            const total = getTotal(d);
+            if (total <= 0) {
+                setError(`Celková částka pro ${d.login} musí být kladná`);
+                return;
+            }
+            const amountStr = total.toString();
+            if (amountStr.includes('.') && amountStr.split('.')[1].length > 2) {
+                setError(`Částka pro ${d.login} má více než 2 desetinná místa`);
+                return;
+            }
+            const foods = d.selectedFoods.map(i => menu?.food?.[i]?.name).filter(Boolean).join(', ');
+            const purposeBase = `Oběd ${locationName}${foods ? ` — ${foods}` : ''}`;
+            recipients.push({
+                login: d.login,
+                purpose: purposeBase.substring(0, 60),
+                amount: total,
+            });
+        }
+
+        if (recipients.length === 0) {
+            setError("Nebyl vybrán žádný příjemce");
+            return;
+        }
+
+        setLoading(true);
+        try {
+            const response = await generateQr({
+                body: { recipients, bankAccount, bankAccountHolder },
+            });
+            if (response.error) {
+                setError((response.error as any).error || 'Nastala chyba při generování QR kódů');
+            } else {
+                setSuccess(true);
+                setTimeout(() => onClose(), 2000);
+            }
+        } catch (e: any) {
+            setError(e.message || 'Nastala chyba při generování QR kódů');
+        } finally {
+            setLoading(false);
+        }
+    };
+
+    const anyParseFailed = diners.some(d => d.baseAmountParseFailed && d.included);
+
+    return (
+        <Modal show={isOpen} onHide={onClose} size="lg">
+            <Modal.Header closeButton>
+                <Modal.Title><h2>Zaplatit za všechny — {locationName}</h2></Modal.Title>
+            </Modal.Header>
+            <Modal.Body>
+                {success ? (
+                    <Alert variant="success">
+                        QR kódy byly úspěšně vygenerovány! Uživatelé je uvidí v sekci „Nevyřízené platby".
+                    </Alert>
+                ) : (
+                    <>
+                        <p>Zaplatili jste za skupinu v restauraci. Nastavte příplatky a dýško, poté vygenerujte QR kódy pro ostatní.</p>
+
+                        {!hasMenu && (
+                            <Alert variant="info">
+                                Pro tuto skupinu nejsou k dispozici ceny jídel — vyplňte příplatky ručně.
+                            </Alert>
+                        )}
+
+                        {anyParseFailed && (
+                            <Alert variant="warning">
+                                U některých jídel se nepodařilo načíst cenu — doplňte ji ručně v sloupci Příplatek.
+                            </Alert>
+                        )}
+
+                        {error && (
+                            <Alert variant="danger" onClose={() => setError(null)} dismissible>
+                                {error}
+                            </Alert>
+                        )}
+
+                        <Table striped bordered hover responsive size="sm">
+                            <thead>
+                                <tr>
+                                    <th style={{ width: 40 }}></th>
+                                    <th>Strávník</th>
+                                    <th>Jídla</th>
+                                    <th style={{ width: 220 }}>Příplatek</th>
+                                    <th style={{ width: 90 }}>Dýško</th>
+                                    <th style={{ width: 90 }}>Celkem</th>
+                                </tr>
+                            </thead>
+                            <tbody>
+                                {diners.map(d => {
+                                    const isPayer = d.login === payerLogin;
+                                    const foodNames = d.selectedFoods.map(i => menu?.food?.[i]?.name).filter(Boolean).join(', ');
+                                    const total = getTotal(d);
+                                    return (
+                                        <tr key={d.login} className={!d.included && !isPayer ? 'text-muted' : ''}>
+                                            <td className="text-center">
+                                                {isPayer ? (
+                                                    <small className="text-muted">plátce</small>
+                                                ) : (
+                                                    <Form.Check
+                                                        type="checkbox"
+                                                        checked={d.included}
+                                                        onChange={e => handleInclude(d.login, e.target.checked)}
+                                                    />
+                                                )}
+                                            </td>
+                                            <td><strong>{d.login}</strong></td>
+                                            <td>
+                                                <small>
+                                                    {foodNames || <span className="text-muted">—</span>}
+                                                    {hasMenu && d.baseAmount > 0 && <span className="text-muted"> ({d.baseAmount} Kč)</span>}
+                                                    {d.baseAmountParseFailed && <span className="text-warning"> ⚠</span>}
+                                                </small>
+                                            </td>
+                                            <td>
+                                                {!isPayer && (
+                                                    <div className="d-flex gap-1">
+                                                        <Form.Control
+                                                            type="text"
+                                                            placeholder="popis"
+                                                            value={d.surchargeText}
+                                                            onChange={e => handleSurchargeText(d.login, e.target.value)}
+                                                            disabled={!d.included}
+                                                            size="sm"
+                                                            onKeyDown={e => e.stopPropagation()}
+                                                        />
+                                                        <Form.Control
+                                                            type="text"
+                                                            placeholder="Kč"
+                                                            value={d.surchargeAmount}
+                                                            onChange={e => handleSurchargeAmount(d.login, e.target.value)}
+                                                            disabled={!d.included}
+                                                            size="sm"
+                                                            style={{ width: 70 }}
+                                                            onKeyDown={e => e.stopPropagation()}
+                                                        />
+                                                    </div>
+                                                )}
+                                            </td>
+                                            <td className="text-end">
+                                                {!isPayer && d.included ? `${tipPerPerson} Kč` : '—'}
+                                            </td>
+                                            <td className="text-end fw-bold">
+                                                {!isPayer ? `${total} Kč` : '—'}
+                                            </td>
+                                        </tr>
+                                    );
+                                })}
+                            </tbody>
+                        </Table>
+
+                        <div className="d-flex align-items-center gap-2 mt-2">
+                            <label className="mb-0 text-nowrap">Dýško celkem (Kč):</label>
+                            <Form.Control
+                                type="text"
+                                placeholder="0"
+                                value={tipTotal}
+                                onChange={e => setTipTotal(sanitizeAmount(e.target.value))}
+                                size="sm"
+                                style={{ width: 100 }}
+                                onKeyDown={e => e.stopPropagation()}
+                            />
+                            <small className="text-muted">
+                                {includedDiners.length > 0 && tipPerPerson > 0
+                                    ? `(${tipPerPerson} Kč / osoba)`
+                                    : ''}
+                            </small>
+                        </div>
+                    </>
+                )}
+            </Modal.Body>
+            <Modal.Footer>
+                {!success && (
+                    <>
+                        <span className="me-auto text-muted">
+                            Příjemci: {includedDiners.length}
+                        </span>
+                        <Button variant="secondary" onClick={onClose} disabled={loading}>
+                            Storno
+                        </Button>
+                        <Button
+                            variant="primary"
+                            onClick={handleGenerate}
+                            disabled={loading || includedDiners.length === 0}
+                        >
+                            {loading ? 'Generuji...' : 'Vygenerovat QR'}
+                        </Button>
+                    </>
+                )}
+                {success && (
+                    <Button variant="secondary" onClick={onClose}>Zavřít</Button>
+                )}
+            </Modal.Footer>
+        </Modal>
+    );
+}

client/src/utils/parsePrice.ts

@@ -0,0 +1,11 @@
+/**
+ * Parsuje cenu ve formátu "135 Kč", "135,50 Kč" nebo "135.50 Kč" na číslo.
+ * Vrátí null při selhání.
+ */
+export function parsePriceCzk(raw: string | undefined): number | null {
+    if (!raw) return null;
+    const m = raw.replace(',', '.').match(/(\d+(?:\.\d+)?)/);
+    if (!m) return null;
+    const n = parseFloat(m[1]);
+    return Number.isFinite(n) ? n : null;
+}