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/ads/[id]/page.tsx

@@ -3,6 +3,7 @@ import Link from "next/link";
 import { notFound, redirect } from "next/navigation";
 import { getTranslations } from "next-intl/server";
 import { updateAd } from "@/actions/admin-ads";
+import { Button } from "@/components/ui/button";
 import { prisma } from "@/lib/prisma";
 import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
 import { EditAdDeleteButton } from "../ads-table";
@@ -54,9 +55,9 @@ export default async function EditAd({
 					required
 					maxLength={255}
 				/>
-				<button type="submit" className="btn btn-primary">
+				<Button type="submit" variant="default">
 					{t("form.save")}
-				</button>
+				</Button>
 			</form>
 			<div style={{ marginTop: "1rem" }}>
 				<EditAdDeleteButton id={String(ad.id)} />

src/app/admin/ads/ads-table.tsx

@@ -4,6 +4,7 @@ import { Trash2 } from "lucide-react";
 import Link from "next/link";
 import { useTranslations } from "next-intl";
 import { deleteAd } from "@/actions/admin-ads";
+import { Button } from "@/components/ui/button";
 import { useConfirmDialog } from "@/components/admin/confirm-dialog";
 import { useServerAction } from "@/hooks/use-server-action";
 
@@ -64,15 +65,16 @@ export function AdsTable({ ads }: { ads: AdRow[] }) {
 							<td>
 								<div className="flex items-center gap-2">
 									<Link href={`/admin/ads/${ad.id}`}>{t("edit")}</Link>
-									<button
+									<Button
 										type="button"
-										className="btn btn-danger btn-sm inline-flex items-center gap-1"
+										variant="destructive"
+										size="sm"
 										disabled={isPending}
 										onClick={() => handleDelete(ad)}
 									>
 										<Trash2 className="h-3.5 w-3.5" />
 										{t("delete")}
-									</button>
+									</Button>
 								</div>
 							</td>
 						</tr>
@@ -106,14 +108,14 @@ export function EditAdDeleteButton({ id }: { id: string }) {
 	return (
 		<>
 			{confirmDialog}
-			<button
+			<Button
 				type="button"
-				className="btn btn-danger"
+				variant="destructive"
 				disabled={isPending}
 				onClick={handleDelete}
 			>
 				{t("form.deleteAd")}
-			</button>
+			</Button>
 		</>
 	);
 }

src/app/admin/ads/new/page.tsx

@@ -2,6 +2,7 @@ import { Megaphone } from "lucide-react";
 import Link from "next/link";
 import { redirect } from "next/navigation";
 import { createAd } from "@/actions/admin-ads";
+import { Button } from "@/components/ui/button";
 import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
 
 export default async function NewAd() {
@@ -27,9 +28,9 @@ export default async function NewAd() {
 			</div>
 			<form action={createAd} className="admin-card">
 				<input name="image" placeholder="Image URL" required maxLength={255} />
-				<button type="submit" className="btn btn-primary">
+				<Button type="submit" variant="default">
 					Create
-				</button>
+				</Button>
 			</form>
 		</main>
 	);

src/app/admin/ads/page.tsx

@@ -1,6 +1,8 @@
 import Link from "next/link";
 import { getTranslations } from "next-intl/server";
 import { StatusCard } from "@/components/admin/dashboard";
+import { Button } from "@/components/ui/button";
+import { formatDate } from "@/lib/format-date";
 import { prisma } from "@/lib/prisma";
 import { redirect } from "next/navigation";
 import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
@@ -26,15 +28,17 @@ export default async function AdminAds() {
 	}
 
 	const latest = ads[0]?.createdAt
-		? ads[0].createdAt.toISOString().slice(0, 10)
+		? formatDate(ads[0].createdAt, "date")
 		: "—";
 
 	return (
 		<main>
 			<div className="flex justify-end mb-6">
-				<Link href="/admin/ads/new" className="btn btn-primary">
-					+ {t("newAd")}
-				</Link>
+				<Button variant="default" asChild>
+					<Link href="/admin/ads/new">
+						+ {t("newAd")}
+					</Link>
+				</Button>
 			</div>
 
 			<div className="grid grid-cols-[repeat(auto-fit,minmax(180px,1fr))] gap-3.5 mb-6">
@@ -57,7 +61,7 @@ export default async function AdminAds() {
 							id: String(ad.id),
 							image: ad.image,
 							createdAt: ad.createdAt
-								? ad.createdAt.toISOString().slice(0, 10)
+								? formatDate(ad.createdAt, "date")
 								: null,
 						}))}
 					/>