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/dashboard/DashSessions.tsx

@@ -7,8 +7,6 @@ import useModalLock from "../../hooks/useModalLock";
 import apiFetch from "../../utils/api";
 import { formatSessionDate } from "../../utils/dashboardHelpers";
 import { sessionsOptions, type Session } from "../../lib/queries/dashboard";
-import { Skeleton } from "boneyard-js/react";
-import DashSessionsFixture from "../../fixtures/DashSessionsFixture";
 
 const API_BASE = "/api/admin";
 
@@ -154,11 +152,11 @@ export default function DashSessions() {
           )}
         </div>
         <div className="admin-card-body" style={{ padding: 0 }}>
-          <Skeleton
-            name="dash-sessions"
-            loading={sessionsLoading}
-            fixture={<DashSessionsFixture />}
-          >
+          {sessionsLoading ? (
+            <div className="admin-loading">
+              <div className="admin-spinner" />
+            </div>
+          ) : (
             <>
               {sessions.length === 0 && (
                 <div
@@ -231,7 +229,7 @@ export default function DashSessions() {
                 </div>
               )}
             </>
-          </Skeleton>
+          )}
         </div>
       </motion.div>