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/public/ui.tsx

@@ -120,51 +120,4 @@ export function RankBadge({ position }: { position: number }) {
 	);
 }
 
-/* ── Skeleton loaders ────────────────────────────────────────── */
 
-export function Skeleton({
-	className,
-	style,
-}: {
-	className?: string;
-	style?: React.CSSProperties;
-}) {
-	return (
-		<div
-			className={className}
-			style={{
-				...style,
-				backgroundColor:
-					"color-mix(in srgb, var(--color-text-muted) 12%, transparent)",
-				borderRadius: "6px",
-				animation: "shimmer 1.5s ease-in-out infinite",
-			}}
-		/>
-	);
-}
-
-export function SkeletonCard({ lines = 3 }: { lines?: number }) {
-	return (
-		<div className="content-card" style={{ padding: "1rem" }}>
-			<div className="content-card-head" style={{ margin: "-1rem -1rem 1rem" }}>
-				<Skeleton
-					style={{ width: "44px", height: "44px", borderRadius: "999px" }}
-				/>
-				<div style={{ flex: 1, display: "grid", gap: "0.35rem" }}>
-					<Skeleton style={{ height: "16px", width: "60%" }} />
-					<Skeleton style={{ height: "12px", width: "40%" }} />
-				</div>
-			</div>
-			{Array.from({ length: lines }, (_, i) => i).map((n) => (
-				<Skeleton
-					key={`skeleton-line-${n}`}
-					style={{
-						height: "12px",
-						width: `${85 - n * 10}%`,
-						marginBottom: "0.6rem",
-					}}
-				/>
-			))}
-		</div>
-	);
-}