chore: release v1.5.0 (#67)

* chore: release v1.4.0

* feat: timezone-aware locale formatting

- Add TIMEZONE_TO_REGION map for 50+ timezones worldwide
- Combine app language with timezone region (e.g., en + Europe/Berlin → en-DE)
- Fix times displaying in wrong timezone (treated as UTC instead of local)
- Add parseLocalDateTime() to handle ISO strings without UTC conversion
- Users now get regional formatting (24h time, local date format) regardless of app language
- Swedish user with en-SE locale now gets yyyy-mm-dd format and 24h time
- German user with en-DE locale gets dd.mm.yyyy format and 24h time
- Add missing i18n translation key 'lastSent'
- Update all getSystemLocale() calls to pass app language parameter

* chore: release v1.5.0

* fix: timezone-independent test for CI (use 14:00 instead of 22:00)

* fix: make timezone test independent of server timezone

frontend/src/pages/SettingsPage.tsx

@@ -1,6 +1,7 @@
 import { useTranslation } from "react-i18next";
 import { useAppContext } from "../context";
 import { ConfirmModal, ExportModal } from "../components";
+import { getSystemLocale } from "../utils/formatters";
 
 export function SettingsPage() {
 	const { t, i18n } = useTranslation();
@@ -321,13 +322,13 @@ export function SettingsPage() {
 							{settings.nextScheduledCheck && (
 								<div className="schedule-row">
 									<span className="schedule-label">{t('settings.schedule.nextCheck')}</span>
-									<span className="schedule-value">{new Date(settings.nextScheduledCheck).toLocaleString(i18n.language, { day: "2-digit", month: "2-digit", year: "numeric", hour: "2-digit", minute: "2-digit" })}</span>
+									<span className="schedule-value">{new Date(settings.nextScheduledCheck).toLocaleString(getSystemLocale(i18n.language), { day: "2-digit", month: "2-digit", year: "numeric", hour: "2-digit", minute: "2-digit" })}</span>
 								</div>
 							)}
 							{settings.lastAutoEmailSent && (
 								<div className="schedule-row">
 									<span className="schedule-label">{t('settings.schedule.lastSent')}</span>
-									<span className="schedule-value">{new Date(settings.lastAutoEmailSent).toLocaleString(i18n.language, { day: "2-digit", month: "2-digit", year: "numeric", hour: "2-digit", minute: "2-digit" })}</span>
+									<span className="schedule-value">{new Date(settings.lastAutoEmailSent).toLocaleString(getSystemLocale(i18n.language), { day: "2-digit", month: "2-digit", year: "numeric", hour: "2-digit", minute: "2-digit" })}</span>
 								</div>
 							)}
 						</div>