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/transactions/page.tsx

@@ -4,6 +4,7 @@ import type { Prisma } from "@/generated/prisma/client";
 import { StatusCard } from "@/components/admin/dashboard";
 import { calcPagination, parseListParams } from "@/lib/admin-helpers";
 import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
+import { formatDate } from "@/lib/format-date";
 import { prisma } from "@/lib/prisma";
 import {
 	TransactionsTable,
@@ -32,10 +33,6 @@ function statusKind(
 	return "neutral";
 }
 
-function fromDate(d: Date | null | undefined): string {
-	return d ? d.toISOString().slice(0, 16).replace("T", " ") : "—";
-}
-
 function formatAmount(amount: number, currency: string): string {
 	const n = Number(amount);
 	const value = Number.isFinite(n) ? n.toFixed(2) : "0.00";
@@ -160,7 +157,7 @@ export default async function AdminTransactions({
 		status: x.status ?? "",
 		statusKind: statusKind(x.status),
 		transactionId: x.transactionId,
-		date: fromDate(x.createdAt),
+		date: formatDate(x.createdAt),
 	}));
 
 	const pagePaid = rows.filter((r) => r.statusKind === "ok").length;