v1.8.0: warehouse module (16 commits), docházka mzda model, leave_type=holiday removal, api.ts race fix

Highlights:
- Warehouse module: receipts, issues, reservations, inventory, reports, dashboard,
  master data (categories, suppliers, locations), FIFO service, integration tests
- Docházka: mzda PDF counting model (Odpracováno / Vč. svátků / Přesčas / Svátek /
  So/Ne / Noc) with Czech weekday names and decimal hours
- AttendanceAdmin/AttendanceHistory KPI cards unified to mzda formula with
  fund bar colored by delta, badges for Práce/Dov/Nem/Sv/Nep
- Remove leave_type=holiday entirely (auto-computed from Czech public holidays)
- Allow multiple work shifts per day (overlap detection only)
- Pre-flight refresh in api.ts eliminates spurious 401s on fresh page loads
- Prisma: company_settings gets 6 nullable columns for warehouse numbering
  (PRI/VYD/INV prefixes, default patterns); migration seeds defaults

src/admin/components/warehouse/BatchPicker.tsx

@@ -9,6 +9,13 @@ interface Batch {
   is_consumed: boolean;
 }
 
+interface BatchesResponse {
+  batches: Batch[];
+  total_stock: number;
+  reserved_quantity: number;
+  available_quantity: number;
+}
+
 interface BatchPickerProps {
   itemId: number | null;
   value: number | null;
@@ -20,29 +27,48 @@ export default function BatchPicker({
   value,
   onChange,
 }: BatchPickerProps) {
-  const { data: batches } = useQuery({
+  const { data: response } = useQuery({
     queryKey: ["warehouse", "batches", itemId],
     queryFn: () =>
-      jsonQuery<Batch[]>(`/api/admin/warehouse/items/${itemId}/batches`),
+      jsonQuery<BatchesResponse>(
+        `/api/admin/warehouse/items/${itemId}/batches`,
+      ),
     enabled: !!itemId,
   });
+
+  const batches = response?.batches ?? [];
+
   return (
-    <select
-      className="admin-form-select"
-      value={value ?? ""}
-      onChange={(e) => {
-        const batchId = Number(e.target.value);
-        const batch = batches?.find((b) => b.id === batchId);
-        if (batch) onChange(batch.id, Number(batch.unit_price));
-      }}
-    >
-      <option value="">-- auto FIFO --</option>
-      {batches?.map((b) => (
-        <option key={b.id} value={b.id}>
-          {new Date(b.received_at).toLocaleDateString("cs-CZ")} | {b.quantity}{" "}
-          ks | {Number(b.unit_price).toFixed(2)} Kč
-        </option>
-      ))}
-    </select>
+    <div>
+      {response && response.reserved_quantity > 0 && (
+        <div
+          style={{
+            fontSize: "0.75rem",
+            color: "var(--text-tertiary)",
+            marginBottom: "0.25rem",
+          }}
+        >
+          Dostupné: {response.available_quantity} ks (z toho rezervováno:{" "}
+          {response.reserved_quantity} ks)
+        </div>
+      )}
+      <select
+        className="admin-form-select"
+        value={value ?? ""}
+        onChange={(e) => {
+          const batchId = Number(e.target.value);
+          const batch = batches.find((b) => b.id === batchId);
+          if (batch) onChange(batch.id, Number(batch.unit_price));
+        }}
+      >
+        <option value="">-- auto FIFO --</option>
+        {batches.map((b) => (
+          <option key={b.id} value={b.id}>
+            {new Date(b.received_at).toLocaleDateString("cs-CZ")} | {b.quantity}{" "}
+            ks | {Number(b.unit_price).toFixed(2)} Kč
+          </option>
+        ))}
+      </select>
+    </div>
   );
 }