tablet: +/- buttons on cart lines, long-press drink for 1-5 picker

Cart entries (drink lines and Pfand-zurück) now have +/- buttons next
to the quantity instead of only accumulating via repeated taps;
decrementing to 0 removes the line. Long-pressing a drink tile opens
a small overlay with buttons 1-5 to add that many at once — a plain
tap still adds one. The long-press timer is cancelled on pointerup/
leave/cancel, and the click that follows a fired long-press is
swallowed so it doesn't also add a plain 1x.

client/src/styles.css

@@ -155,6 +155,46 @@ button.danger { background: #5a2a2a; border-color: #7a3a3a; color: #fff; }
   color: #fff;
 }
 
+.picker-backdrop {
+  position: fixed;
+  inset: 0;
+  background: rgba(0, 0, 0, 0.55);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 10;
+}
+.picker {
+  background: var(--surface);
+  border: 1px solid var(--border);
+  border-radius: 12px;
+  padding: 20px;
+  width: min(320px, 86vw);
+  display: flex;
+  flex-direction: column;
+  align-items: stretch;
+  gap: 14px;
+}
+.picker-title {
+  font-size: 22px;
+  font-weight: 800;
+  text-align: center;
+}
+.picker-grid {
+  display: grid;
+  grid-template-columns: repeat(5, 1fr);
+  gap: 8px;
+}
+.picker-count {
+  height: 64px;
+  font-size: 26px;
+  font-weight: 800;
+}
+.picker-cancel {
+  background: transparent;
+  border-color: var(--border-soft);
+}
+
 .cart {
   flex: 0 0 38vh;
   background: var(--surface);
@@ -176,6 +216,7 @@ button.danger { background: #5a2a2a; border-color: #7a3a3a; color: #fff; }
 .cart-line {
   display: flex;
   justify-content: space-between;
+  align-items: center;
   padding: 3px 0;
   font-size: 20px;
   font-weight: 600;
@@ -183,6 +224,20 @@ button.danger { background: #5a2a2a; border-color: #7a3a3a; color: #fff; }
 .cart-line.pfand { color: var(--pfand); }
 .cart-line.return { color: var(--danger); }
 .cart-line.muted { opacity: 0.5; }
+.cart-line-label {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+.qty-btn {
+  flex: 0 0 auto;
+  width: 28px;
+  height: 28px;
+  padding: 0;
+  line-height: 1;
+  font-size: 18px;
+  border-radius: 6px;
+}
 .cart-total {
   font-size: 56px;
   font-weight: 800;

client/src/tablet/Sale.tsx

@@ -1,5 +1,5 @@
-import { useMemo, useState } from 'preact/hooks';
+import { useMemo, useRef, useState } from 'preact/hooks';
-import type { BarConfig, CartItem } from '@wutzcalc/shared';
+import type { BarConfig, CartItem, Drink } from '@wutzcalc/shared';
 import { api, formatCents, uuid } from '../api';
 
 interface Props {
@@ -9,14 +9,21 @@ interface Props {
 
 type Line = { drink_id: number; qty: number };
 
+const LONG_PRESS_MS = 450;
+const PICKER_COUNTS = [1, 2, 3, 4, 5];
+
 export function Sale({ config, onChangeBar }: Props) {
   const { bar, drinks } = config;
   const [lines, setLines] = useState<Line[]>([]);
   const [pfandReturns, setPfandReturns] = useState(0);
   const [submitting, setSubmitting] = useState(false);
+  const [pickerDrink, setPickerDrink] = useState<Drink | null>(null);
+
+  const longPressTimer = useRef<number | null>(null);
+  const longPressFired = useRef(false);
 
   const drinkById = useMemo(() => {
-    const m = new Map<number, typeof drinks[number]>();
+    const m = new Map<number, Drink>();
     drinks.forEach(d => m.set(d.id, d));
     return m;
   }, [drinks]);
@@ -30,15 +37,27 @@ export function Sale({ config, onChangeBar }: Props) {
     return drinksSum - bar.pfand_cents * pfandReturns;
   }, [lines, drinkById, bar.pfand_cents, pfandReturns]);
 
-  function addDrink(drinkId: number) {
+  function addDrink(drinkId: number, qty = 1) {
     setLines(prev => {
       const i = prev.findIndex(l => l.drink_id === drinkId);
       if (i >= 0) {
         const copy = prev.slice();
-        copy[i] = { ...copy[i]!, qty: copy[i]!.qty + 1 };
+        copy[i] = { ...copy[i]!, qty: copy[i]!.qty + qty };
         return copy;
       }
-      return [...prev, { drink_id: drinkId, qty: 1 }];
+      return [...prev, { drink_id: drinkId, qty }];
+    });
+  }
+
+  function incLine(drinkId: number, delta: number) {
+    setLines(prev => {
+      const i = prev.findIndex(l => l.drink_id === drinkId);
+      if (i < 0) return prev;
+      const nextQty = prev[i]!.qty + delta;
+      if (nextQty <= 0) return prev.filter(l => l.drink_id !== drinkId);
+      const copy = prev.slice();
+      copy[i] = { ...copy[i]!, qty: nextQty };
+      return copy;
     });
   }
 
@@ -46,11 +65,46 @@ export function Sale({ config, onChangeBar }: Props) {
     setPfandReturns(n => n + 1);
   }
 
+  function incPfandReturns(delta: number) {
+    setPfandReturns(n => Math.max(0, n + delta));
+  }
+
   function clear() {
     setLines([]);
     setPfandReturns(0);
   }
 
+  function startLongPress(d: Drink) {
+    longPressFired.current = false;
+    cancelLongPress();
+    longPressTimer.current = window.setTimeout(() => {
+      longPressFired.current = true;
+      setPickerDrink(d);
+    }, LONG_PRESS_MS);
+  }
+
+  function cancelLongPress() {
+    if (longPressTimer.current != null) {
+      clearTimeout(longPressTimer.current);
+      longPressTimer.current = null;
+    }
+  }
+
+  function handleDrinkClick(d: Drink) {
+    // a long press already opened the count picker for this tap — swallow
+    // the click that pointerup/click also fires, don't add a plain 1×.
+    if (longPressFired.current) {
+      longPressFired.current = false;
+      return;
+    }
+    addDrink(d.id);
+  }
+
+  function pickCount(n: number) {
+    if (pickerDrink) addDrink(pickerDrink.id, n);
+    setPickerDrink(null);
+  }
+
   const pfandCount = useMemo(() => lines.reduce((sum, l) => sum + l.qty, 0), [lines]);
 
   const isEmpty = lines.length === 0 && pfandReturns === 0;
@@ -87,7 +141,16 @@ export function Sale({ config, onChangeBar }: Props) {
 
       <div class="grid">
         {drinks.map(d => (
-          <button key={d.id} class="drink" onClick={() => addDrink(d.id)}>
+          <button
+            key={d.id}
+            class="drink"
+            onPointerDown={() => startLongPress(d)}
+            onPointerUp={cancelLongPress}
+            onPointerLeave={cancelLongPress}
+            onPointerCancel={cancelLongPress}
+            onContextMenu={e => e.preventDefault()}
+            onClick={() => handleDrinkClick(d)}
+          >
             <div class="name">{d.name}</div>
             <div class="price">{formatCents(d.price_cents)}</div>
             {bar.pfand_cents > 0 && (
@@ -103,6 +166,24 @@ export function Sale({ config, onChangeBar }: Props) {
         )}
       </div>
 
+      {pickerDrink && (
+        <div class="picker-backdrop" onClick={() => setPickerDrink(null)}>
+          <div class="picker" onClick={e => e.stopPropagation()}>
+            <div class="picker-title">{pickerDrink.name}</div>
+            <div class="picker-grid">
+              {PICKER_COUNTS.map(n => (
+                <button key={n} class="picker-count" onClick={() => pickCount(n)}>
+                  {n}
+                </button>
+              ))}
+            </div>
+            <button class="picker-cancel" onClick={() => setPickerDrink(null)}>
+              Abbrechen
+            </button>
+          </div>
+        </div>
+      )}
+
       <div class="cart">
         <div class="cart-items">
           {isEmpty && <div class="cart-line muted">Keine Einträge</div>}
@@ -111,7 +192,15 @@ export function Sale({ config, onChangeBar }: Props) {
             if (!d) return null;
             return (
               <div key={i} class="cart-line">
-                <span>{l.qty}× {d.name}</span>
+                <div class="cart-line-label">
+                  <button class="qty-btn" onClick={() => incLine(l.drink_id, -1)} aria-label="weniger">
+                    −
+                  </button>
+                  <span>{l.qty}× {d.name}</span>
+                  <button class="qty-btn" onClick={() => incLine(l.drink_id, 1)} aria-label="mehr">
+                    +
+                  </button>
+                </div>
                 <span>{formatCents(d.price_cents * l.qty)}</span>
               </div>
             );
@@ -124,7 +213,15 @@ export function Sale({ config, onChangeBar }: Props) {
           )}
           {pfandReturns > 0 && (
             <div class="cart-line return">
-              <span>{pfandReturns}× Pfand zurück</span>
+              <div class="cart-line-label">
+                <button class="qty-btn" onClick={() => incPfandReturns(-1)} aria-label="weniger">
+                  −
+                </button>
+                <span>{pfandReturns}× Pfand zurück</span>
+                <button class="qty-btn" onClick={() => incPfandReturns(1)} aria-label="mehr">
+                  +
+                </button>
+              </div>
               <span>{formatCents(-bar.pfand_cents * pfandReturns)}</span>
             </div>
           )}