feat: human + relative dates; fix language/theme toggle stale-context

Dates were raw ISO on printed slips and time-only in the UI (a session from
two days ago showed just "10:48"). Make them human and day-relative. Also fix
a latent toggle bug surfaced while testing.

Dates:
- Printed tickets/receipts/subscription cards now show "19 Qershor 2026
  10:48:25" (Albanian month, 24h with seconds) instead of YYYY-MM-DD HH:MM.
  stamp() exported as formatStampSq so the shift Z-report shares it.
- Shift Z-report is now Albanian (Operatori/Nga/Deri/Para në dorë/Arka…),
  was English-only with ISO dates.
- Web sessions/logs/history show relative days: "Sot 10:48" / "Dje 17:33" /
  "17 Qershor 10:48" via formatRelativeDateTime(). Month names come from the
  i18n catalog (common.months), NOT Intl — the appliance browser's ICU lacks
  Albanian locale data and Intl silently falls back to English month names.

Toggle fix:
- The language + theme toggles read the active value from the TanStack Router
  context `user`, which is captured at route-resolution time and does not
  re-render on setUser. After one switch the highlight froze and the equality
  guard blocked switching back until a page refresh. Drive them off live state
  instead: language from i18n.language (useTranslation subscribes to
  languageChanged), theme from local useState. (Bug dated to 040c0ff.)

Claude-Session: https://claude.ai/code/session_01Xcm6ikLgGoCxxHrxtjkk5V

apps/server/src/shift-service.ts

@@ -1,5 +1,5 @@
 import { eq, devices, ledgerEvents, type Db } from "@parking/db";
-import { registry, type PrinterDevice } from "@parking/devices";
+import { registry, formatStampSq as zStamp, type PrinterDevice } from "@parking/devices";
 import type { LedgerPayload } from "@parking/shared";
 import type { FastifyBaseLogger } from "fastify";
 import type { EventLog } from "./event-log.js";
@@ -393,21 +393,23 @@ export class ShiftService {
     }
     const cur = r.currency ?? "";
     const money = (m: number) => (m / 100).toFixed(2);
+    // Customer/operator-facing print is Albanian (see i18n.md — printed slips are not
+    // governed by the UI language), with human dates "19 Qershor 2026 10:48:25".
     const lines = [
-      `Operator: ${r.operator}`,
-      `From: ${r.startedAt}`,
-      `To:   ${r.endedAt}`,
+      `Operatori: ${r.operator}`,
+      `Nga:  ${zStamp(r.startedAt)}`,
+      `Deri: ${zStamp(r.endedAt)}`,
       "",
-      `Payments: ${r.paymentCount}`,
-      `Cash: ${money(r.cashTotalMinor)} ${cur}`,
-      `Card: ${money(r.cardTotalMinor)} ${cur}`,
+      `Pagesa: ${r.paymentCount}`,
+      `Para në dorë: ${money(r.cashTotalMinor)} ${cur}`,
+      `Kartë:        ${money(r.cardTotalMinor)} ${cur}`,
       "",
-      "-- Drawer --",
-      `Opening float: ${money(r.openingFloatMinor)} ${cur}`,
-      `Cash taken:    ${money(r.cashTotalMinor)} ${cur}`,
-      `Cash added:    ${money(r.cashAddedMinor)} ${cur}`,
-      `Cash removed:  ${money(r.cashRemovedMinor)} ${cur}`,
-      `Expected drawer: ${money(r.expectedDrawerMinor)} ${cur}`,
+      "-- Arka --",
+      `Fillimi (kusur):  ${money(r.openingFloatMinor)} ${cur}`,
+      `Para të marra:    ${money(r.cashTotalMinor)} ${cur}`,
+      `Para të shtuara:  ${money(r.cashAddedMinor)} ${cur}`,
+      `Para të hequra:   ${money(r.cashRemovedMinor)} ${cur}`,
+      `Arka e pritur:    ${money(r.expectedDrawerMinor)} ${cur}`,
     ];
     try {
       await printer.printReport({ title: "RAPORT TURNI", lines });