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/AdminDatePicker.tsx

@@ -1,4 +1,4 @@
-import { forwardRef, useMemo } from "react";
+import { forwardRef } from "react";
 import DatePicker, { registerLocale } from "react-datepicker";
 import { cs } from "date-fns/locale";
 import { parse, format } from "date-fns";
@@ -124,7 +124,7 @@ export default function AdminDatePicker({
   disabled,
   placeholder,
 }: AdminDatePickerProps) {
-  const useNative = useMemo(() => isTouchDevice(), []);
+  const useNative = isTouchDevice();
 
   if (useNative) {
     return (
@@ -178,15 +178,12 @@ export default function AdminDatePicker({
     return undefined;
   };
 
-  const customInput = useMemo(
-    () => (
-      <CustomInput
-        required={required}
-        placeholder={placeholder}
-        disabled={disabled}
-      />
-    ),
-    [required, placeholder, disabled],
+  const customInput = (
+    <CustomInput
+      required={required}
+      placeholder={placeholder}
+      disabled={disabled}
+    />
   );
 
   const commonProps = {
@@ -194,6 +191,7 @@ export default function AdminDatePicker({
     onChange: handleChange,
     locale: "cs",
     customInput,
+    placeholderText: placeholder,
     minDate: parseMinMax(minDate),
     maxDate: parseMinMax(maxDate),
     popperPlacement: "bottom-start" as const,