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/writeable-boxes/page.tsx

@@ -6,6 +6,7 @@ import {
 	updateBox,
 } from "@/actions/admin-writeable-boxes";
 import { StatusCard } from "@/components/admin/dashboard";
+import { Button } from "@/components/ui/button";
 import { prisma } from "@/lib/prisma";
 import { redirect } from "next/navigation";
 import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
@@ -131,9 +132,9 @@ export default async function AdminWriteableBoxes() {
 							justifyContent: "flex-end",
 						}}
 					>
-						<button type="submit" className="btn btn-primary">
+						<Button type="submit" variant="default">
 							{t("form.save")}
-						</button>
+						</Button>
 					</div>
 				</form>
 			</section>
@@ -262,9 +263,9 @@ export default async function AdminWriteableBoxes() {
 											justifyContent: "flex-end",
 										}}
 									>
-										<button type="submit" className="btn btn-primary">
+										<Button type="submit" variant="default">
 											{t("form.save")}
-										</button>
+										</Button>
 									</div>
 								</form>
 
@@ -284,15 +285,15 @@ export default async function AdminWriteableBoxes() {
 											name="next"
 											value={box.isActive ? "0" : "1"}
 										/>
-										<button type="submit" className="btn">
-											{box.isActive ? t("hide") : t("activate")}
-										</button>
+									<Button type="submit" variant="outline">
+										{box.isActive ? t("hide") : t("activate")}
+									</Button>
 									</form>
 									<form action={deleteBox}>
 										<input type="hidden" name="id" value={String(box.id)} />
-										<button type="submit" className="btn btn-danger">
+										<Button type="submit" variant="destructive">
 											{t("delete")}
-										</button>
+										</Button>
 									</form>
 								</div>
 							</div>