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/ProjectFileManager.tsx

@@ -4,8 +4,6 @@ import { projectFilesOptions } from "../lib/queries/projects";
 import { useAlert } from "../context/AlertContext";
 import ConfirmModal from "./ConfirmModal";
 import apiFetch from "../utils/api";
-import { Skeleton } from "boneyard-js/react";
-import ProjectFileManagerFixture from "../fixtures/ProjectFileManagerFixture";
 
 const API_BASE = "/api/admin";
 
@@ -472,13 +470,9 @@ export default function ProjectFileManager({
 
   if (filesLoading && items.length === 0 && !errorMessage) {
     return (
-      <Skeleton
-        name="project-file-manager"
-        loading={filesLoading && items.length === 0}
-        fixture={<ProjectFileManagerFixture />}
-      >
-        <div />
-      </Skeleton>
+      <div className="admin-loading">
+        <div className="admin-spinner" />
+      </div>
     );
   }