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/lib/action-helper.test.ts

@@ -0,0 +1,42 @@
+import { describe, expect, it, vi, beforeEach } from "vitest";
+
+const mockError = vi.hoisted(() => vi.fn());
+
+vi.mock("@/lib/logger", () => ({
+	logger: { error: mockError },
+}));
+
+import { wrapAction, actionError } from "./action-helper";
+
+beforeEach(() => {
+	mockError.mockReset();
+});
+
+describe("wrapAction", () => {
+	it("returns success with data when fn resolves", async () => {
+		const result = await wrapAction(async () => "hello", "testAction");
+		expect(result).toEqual({ success: true, data: "hello" });
+	});
+
+	it("returns failure and logs when fn throws", async () => {
+		const result = await wrapAction(async () => {
+			throw new Error("boom");
+		}, "testAction");
+		expect(result).toEqual({ success: false, error: "boom" });
+		expect(mockError).toHaveBeenCalledWith("Action failed: testAction", {
+			action: "testAction",
+			error: "boom",
+		});
+	});
+});
+
+describe("actionError", () => {
+	it("returns failure result and logs", () => {
+		const result = actionError("myAction", "something went wrong");
+		expect(result).toEqual({ success: false, error: "something went wrong" });
+		expect(mockError).toHaveBeenCalledWith("Action failed: myAction", {
+			action: "myAction",
+			error: "something went wrong",
+		});
+	});
+});