test: add unit tests for pure logic modules

Add 22 test files covering imager, soundtracks, browser-headers, source-keys (figure/pet/effect), effect-source, plus catalog-translations, catalog-layouts, client-translation-files, translations-utils, and various admin/services/helpers modules. Total test count increases by 120+.

src/lib/services/currency.test.ts

@@ -2,15 +2,19 @@ import { describe, expect, it } from "vitest";
 import { CurrencyType, currencyLabel } from "./currency";
 
 describe("CurrencyType", () => {
-	it("uses the emulator-fixed numeric values", () => {
+	it("keeps emulator-dictated numeric values", () => {
 		expect(CurrencyType.Credits).toBe(-1);
 		expect(CurrencyType.Duckets).toBe(0);
 		expect(CurrencyType.Diamonds).toBe(5);
 		expect(CurrencyType.Points).toBe(101);
 	});
+});
 
-	it("maps each type to a human label", () => {
+describe("currencyLabel", () => {
+	it("returns friendly labels for each currency", () => {
 		expect(currencyLabel(CurrencyType.Credits)).toBe("Credits");
+		expect(currencyLabel(CurrencyType.Duckets)).toBe("Duckets");
 		expect(currencyLabel(CurrencyType.Diamonds)).toBe("Diamonds");
+		expect(currencyLabel(CurrencyType.Points)).toBe("Points");
 	});
 });