refactor: full codebase overhaul — dead code removal, env validation, logger migration, date consolidation, Prisma schema cleanup, button consistency, useEffect deps, test coverage

- env.ts: added 10 missing Zod-validated env vars (imager, paypal currency, argon2/bcrypt params)
- Migrated 6 modules from process.env to validated env.* (auth, proxy-auth, paypal, password, redis, imager, moderation, alert, logger)
- Replaced console.warn/error with pino logger in 9 server-side modules
- Removed 50+ dead exports (SWF wrappers, coalesceHotelName, signIn, isStaff re-export, formatTimestamp, Skeleton/SkeletonCard, 4 unused housekeeping sections)
- Consolidated date formatting: 28 files migrated to shared formatDate() from @/lib/format-date
- Wired 4 radio/settings API routes through cached siteSettings service instead of raw Prisma queries
- Added getMany()/getAll() helpers to SiteSettings service
- Removed 88 dead Prisma model definitions (schema 2763→1846 lines)
- Created admin action-helper.ts with wrapAction() for standardized error handling
- Fixed useEffect dependency arrays in 4 data-heavy components
- Replaced raw btn CSS classes with shadcn Button component across admin pages
- Stripped dead i18n namespaces (common, pages.client) from all 22 translation files
- Removed 2 dead scripts (create-release.sh, check-local-imports.ts)
- Fixed knip.json configuration
- Added 7 new test suites: format-date, paypal, moderation, alert, webhook, action-helper, and fixed password.test.ts for env mocking
- All 358 tests passing across 72 test files
- TypeScript: 0 errors

src/app/admin/calendar/[id]/page.tsx

@@ -1,6 +1,7 @@
 import Link from "next/link";
 import { notFound, redirect } from "next/navigation";
 import { getTranslations } from "next-intl/server";
+import { formatDate } from "@/lib/format-date";
 import { prisma } from "@/lib/prisma";
 import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
 
@@ -31,11 +32,6 @@ type Reward = {
 	subscriptionDays: number;
 };
 
-function fmtDate(ts: number): string {
-	if (!ts) return "—";
-	return new Date(ts * 1000).toISOString().slice(0, 10);
-}
-
 export default async function AdminCalendarCampaign({
 	params,
 }: {
@@ -119,7 +115,7 @@ export default async function AdminCalendarCampaign({
 						{t("detail.campaignMeta", {
 							id: campaign.id,
 							days: campaign.totalDays,
-							date: fmtDate(campaign.startTimestamp),
+							date: formatDate(new Date(campaign.startTimestamp * 1000), "date"),
 						})}
 						{disabled
 							? ` · ${t("detail.disabled")}`

src/app/admin/calendar/page.tsx

@@ -3,6 +3,7 @@ import { redirect } from "next/navigation";
 import { getTranslations } from "next-intl/server";
 import { StatusCard } from "@/components/admin/dashboard";
 import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
+import { formatDate } from "@/lib/format-date";
 import { prisma } from "@/lib/prisma";
 
 export const dynamic = "force-dynamic";
@@ -17,11 +18,6 @@ type Campaign = {
 	enabled: string;
 };
 
-function fmtDate(ts: number): string {
-	if (!ts) return "—";
-	return new Date(ts * 1000).toISOString().slice(0, 10);
-}
-
 export default async function AdminCalendar() {
 	const { session, permissions } = await getAdminContext();
 	if (!canAccess(permissions, PERMS.SHOP_VIEW, session.user.rank)) {
@@ -122,7 +118,7 @@ export default async function AdminCalendar() {
 										})}
 									</p>
 									<p className="text-xs theme-text-muted dark:theme-text-muted mt-1">
-										{t("startsAt", { date: fmtDate(c.startTimestamp) })}
+										{t("startsAt", { date: formatDate(new Date(c.startTimestamp * 1000), "date") })}
 										{c.lockExpired === "1" ? ` · ${t("locksExpired")}` : ""}
 									</p>
 								</div>