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/favicon/favicon-form.tsx

@@ -4,6 +4,7 @@ import Image from "next/image";
 import { useTranslations } from "next-intl";
 import { useRef, useState } from "react";
 import { deleteFavicon, saveFavicon } from "@/actions/save-favicon";
+import { Button } from "@/components/ui/button";
 import { useConfirmDialog } from "@/components/admin/confirm-dialog";
 import { FaviconGenerator } from "./favicon-generator";
 
@@ -116,22 +117,22 @@ export function FaviconForm({ currentUrl }: { currentUrl: string | null }) {
 					</div>
 
 					<div className="flex gap-2">
-						<button
+						<Button
 							type="submit"
 							disabled={uploading}
-							className="btn btn-primary"
+							variant="default"
 						>
 							{uploading ? t("uploading") : t("upload")}
-						</button>
+						</Button>
 						{preview && (
-							<button
+							<Button
 								type="button"
 								onClick={handleDelete}
 								disabled={deleting}
-								className="btn btn-danger"
+								variant="destructive"
 							>
 								{deleting ? t("deleting") : t("delete")}
-							</button>
+							</Button>
 						)}
 					</div>
 				</form>

src/app/admin/favicon/favicon-generator.tsx

@@ -2,6 +2,7 @@
 
 import { useTranslations } from "next-intl";
 import { useCallback, useEffect, useRef, useState } from "react";
+import { Button } from "@/components/ui/button";
 
 const SIZE = 64;
 const HALF = SIZE / 2;
@@ -185,13 +186,14 @@ export function FaviconGenerator({ onSave }: Props) {
 					</label>
 				</div>
 
-				<button
+				<Button
 					type="button"
 					onClick={handleSave}
-					className="btn btn-primary w-full"
+					variant="default"
+					className="w-full"
 				>
 					{t("save")}
-				</button>
+				</Button>
 			</div>
 		</div>
 	);