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/variables.css

@@ -32,6 +32,11 @@
   --border-radius-lg: 16px;
   --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
   --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
+
+  /* Motion durations (respect prefers-reduced-motion in code) */
+  --motion-fast: 0.2s;
+  --motion-base: 0.25s;
+  --motion-slow: 0.5s;
   --font-heading: "Urbanist", sans-serif;
   --font-body: "Plus Jakarta Sans", sans-serif;
   --font-mono: "DM Mono", "Menlo", monospace;