feat: multi-popular toggle for pricing, BYN price field for master classes

- Replace single popular dropdown with per-item toggle switch in pricing admin
- Add PriceField component to master classes admin (strips/adds BYN suffix)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/admin/pricing/page.tsx

@@ -63,45 +63,28 @@ export default function PricingEditorPage() {
             onChange={(v) => update({ ...data, subtitle: v })}
           />
 
-          {/* Popular & Featured selectors */}
+          {/* Featured selector */}
           {(() => {
             const itemOptions = data.items
               .map((it, idx) => ({ value: String(idx), label: it.name }))
               .filter((o) => o.label.trim() !== "");
             const noneOption = { value: "", label: "— Нет —" };
-
-            const popularIdx = data.items.findIndex((it) => it.popular);
             const featuredIdx = data.items.findIndex((it) => it.featured);
 
             return (
-              <div className="grid gap-3 sm:grid-cols-2">
-                <SelectField
-                  label="Популярный абонемент"
-                  value={popularIdx >= 0 ? String(popularIdx) : ""}
-                  onChange={(v) => {
-                    const items = data.items.map((it, idx) => ({
-                      ...it,
-                      popular: v ? idx === Number(v) : false,
-                    }));
-                    update({ ...data, items });
-                  }}
-                  options={[noneOption, ...itemOptions]}
-                  placeholder="Выберите..."
-                />
-                <SelectField
-                  label="Выделенный абонемент (безлимит)"
-                  value={featuredIdx >= 0 ? String(featuredIdx) : ""}
-                  onChange={(v) => {
-                    const items = data.items.map((it, idx) => ({
-                      ...it,
-                      featured: v ? idx === Number(v) : false,
-                    }));
-                    update({ ...data, items });
-                  }}
-                  options={[noneOption, ...itemOptions]}
-                  placeholder="Выберите..."
-                />
-              </div>
+              <SelectField
+                label="Выделенный абонемент (безлимит)"
+                value={featuredIdx >= 0 ? String(featuredIdx) : ""}
+                onChange={(v) => {
+                  const items = data.items.map((it, idx) => ({
+                    ...it,
+                    featured: v ? idx === Number(v) : false,
+                  }));
+                  update({ ...data, items });
+                }}
+                options={[noneOption, ...itemOptions]}
+                placeholder="Выберите..."
+              />
             );
           })()}
 
@@ -110,22 +93,42 @@ export default function PricingEditorPage() {
             items={data.items}
             onChange={(items) => update({ ...data, items })}
             renderItem={(item, _i, updateItem) => (
-              <div className="grid gap-3 sm:grid-cols-3">
-                <InputField
-                  label="Название"
-                  value={item.name}
-                  onChange={(v) => updateItem({ ...item, name: v })}
-                />
-                <PriceField
-                  label="Цена"
-                  value={item.price}
-                  onChange={(v) => updateItem({ ...item, price: v })}
-                />
-                <InputField
-                  label="Примечание"
-                  value={item.note || ""}
-                  onChange={(v) => updateItem({ ...item, note: v })}
-                />
+              <div className="space-y-3">
+                <div className="grid gap-3 sm:grid-cols-3">
+                  <InputField
+                    label="Название"
+                    value={item.name}
+                    onChange={(v) => updateItem({ ...item, name: v })}
+                  />
+                  <PriceField
+                    label="Цена"
+                    value={item.price}
+                    onChange={(v) => updateItem({ ...item, price: v })}
+                  />
+                  <InputField
+                    label="Примечание"
+                    value={item.note || ""}
+                    onChange={(v) => updateItem({ ...item, note: v })}
+                  />
+                </div>
+                <label className="inline-flex items-center gap-2 cursor-pointer select-none">
+                  <button
+                    type="button"
+                    role="switch"
+                    aria-checked={!!item.popular}
+                    onClick={() => updateItem({ ...item, popular: !item.popular })}
+                    className={`relative h-5 w-9 rounded-full transition-colors ${
+                      item.popular ? "bg-gold" : "bg-neutral-600"
+                    }`}
+                  >
+                    <span
+                      className={`absolute top-0.5 left-0.5 h-4 w-4 rounded-full bg-white transition-transform ${
+                        item.popular ? "translate-x-4" : ""
+                      }`}
+                    />
+                  </button>
+                  <span className="text-sm text-neutral-400">Популярный</span>
+                </label>
               </div>
             )}
             createItem={() => ({ name: "", price: "", note: "" })}