Add CZK to the preferred currency picker

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: vAhyThe

Sources/CodexBar/PreferencesGeneralPane.swift

@@ -80,6 +80,7 @@ enum PreferredCurrencyOption: String, CaseIterable, Identifiable {
     case usd = "USD"
     case gbp = "GBP"
     case eur = "EUR"
+    case czk = "CZK"
     case cny = "CNY"
     case jpy = "JPY"
     case krw = "KRW"
@@ -100,6 +101,7 @@ enum PreferredCurrencyOption: String, CaseIterable, Identifiable {
         case .usd: "USD ($)"
         case .gbp: "GBP (£)"
         case .eur: "EUR (€)"
+        case .czk: "CZK (Kč)"
         case .cny: "CNY (¥)"
         case .jpy: "JPY (¥)"
         case .krw: "KRW (₩)"

Sources/CodexBarCore/CurrencyExchange.swift

@@ -15,7 +15,7 @@ public final class CurrencyExchange: @unchecked Sendable {
 
     /// All currency codes supported by the converter.
     public static let supportedCurrencies: [String] = [
-        "USD", "GBP", "EUR", "CNY", "JPY", "KRW", "CAD", "AUD", "HKD", "TWD", "SGD", "INR",
+        "USD", "GBP", "EUR", "CZK", "CNY", "JPY", "KRW", "CAD", "AUD", "HKD", "TWD", "SGD", "INR",
     ]
 
     private let lock = NSLock()
@@ -25,6 +25,7 @@ public final class CurrencyExchange: @unchecked Sendable {
         "USD": 1.0,
         "GBP": 0.79,
         "EUR": 0.92,
+        "CZK": 21.0,
         "CNY": 7.27,
         "JPY": 154.0,
         "KRW": 1428.90,

Tests/CodexBarTests/UsageFormatterTests.swift

@@ -517,6 +517,12 @@ struct UsageFormatterTests {
         #expect(explicitKRW.contains("₩"))
         #expect(!explicitKRW.contains("."))
 
+        let czkRate = exchange.rate(for: "CZK") ?? 21.0
+        #expect(abs((exchange.convert(usdAmount: 10.0, to: "CZK") ?? 0) - 10.0 * czkRate) < epsilon)
+        let explicitCZK = UsageFormatter.convertedCostString(10.0, preferredCurrency: "CZK", providerCurrency: "USD")
+        #expect(explicitCZK.contains("CZK"))
+        #expect(explicitCZK.contains("."))
+
         #expect(exchange.convert(amount: 10.0, from: "CHF", to: "USD") == nil)
         let unavailable = UsageFormatter.convertedCostString(
             10.0,
@@ -535,6 +541,7 @@ struct UsageFormatterTests {
         #expect(CurrencyExchange.requiresLiveRates(preferredCurrencyCode: "GBP"))
         #expect(CurrencyExchange.requiresLiveRates(preferredCurrencyCode: " eur "))
         #expect(CurrencyExchange.requiresLiveRates(preferredCurrencyCode: "KRW"))
+        #expect(CurrencyExchange.requiresLiveRates(preferredCurrencyCode: "CZK"))
     }
 
     @Test