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/logs/chat/chat-table.tsx

@@ -2,7 +2,7 @@
 
 import { useTranslations } from "next-intl";
 import { DataTable } from "@/components/admin/data-table";
-import { formatTimestamp } from "@/lib/admin-helpers";
+import { formatDate } from "@/lib/format-date";
 import type { DataTableColumn, PaginatedResult } from "@/types";
 
 interface ChatLogRow {
@@ -34,7 +34,7 @@ export function ChatTable({ data }: ChatTableProps) {
 			key: "timestamp",
 			label: t("colTime"),
 			sortable: true,
-			render: (value) => <span>{formatTimestamp(Number(value))}</span>,
+			render: (value) => <span>{formatDate(new Date(Number(value) * 1000))}</span>,
 		},
 		{ key: "roomId", label: t("chat.colRoomId"), sortable: true },
 	];