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/components/admin/media-grid.tsx

@@ -3,6 +3,7 @@
 import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import { useTranslations } from "next-intl";
 import { uploadMedia, deleteMedia } from "@/actions/admin-media";
+import { formatDate } from "@/lib/format-date";
 
 type MediaFile = {
 	name: string;
@@ -24,18 +25,6 @@ function formatSize(bytes: number): string {
 	return `${(bytes / (1024 * 1024)).toFixed(1)} MB`;
 }
 
-function formatDate(ms: number): string {
-	try {
-		return new Date(ms).toLocaleDateString(undefined, {
-			year: "numeric",
-			month: "short",
-			day: "numeric",
-		});
-	} catch {
-		return "";
-	}
-}
-
 function extOf(name: string): string {
 	const i = name.lastIndexOf(".");
 	return i >= 0 ? name.slice(i + 1).toUpperCase() : "";
@@ -257,7 +246,7 @@ export function AdminMediaGrid() {
 										{f.name}
 									</p>
 									<p className="text-[11px] m-0 text-[var(--admin-text-muted)]">
-										{formatSize(f.size)} · {formatDate(f.uploaded)}
+										{formatSize(f.size)} · {formatDate(new Date(f.uploaded), "date")}
 									</p>
 									<div className="flex gap-1.5 mt-2">
 										<button