feat: add AED to the preferred currency picker

CHANGELOG.md

@@ -13,6 +13,9 @@
 ### Performance
 - OpenCodex: parse only newly appended usage-log entries instead of rebuilding the entire cache on every refresh, cutting memory use while preserving compatibility with older app versions (#3140). Thanks @olddonkey!
 
+### Usage & Spend
+- Added AED (UAE dirham) to the display currency options (#3186). Thanks @samiashi!
+
 ### Localization
 - Turkish: improve translations throughout settings and provider views, including the previously untranslated iCloud sync section (#3178). Thanks @husodrn46!
 

Sources/CodexBar/PreferencesGeneralPane.swift

@@ -91,6 +91,7 @@ enum PreferredCurrencyOption: String, CaseIterable, Identifiable {
     case sgd = "SGD"
     case inr = "INR"
     case chf = "CHF"
+    case aed = "AED"
 
     var id: String {
         self.rawValue
@@ -113,6 +114,7 @@ enum PreferredCurrencyOption: String, CaseIterable, Identifiable {
         case .sgd: "SGD ($)"
         case .inr: "INR (₹)"
         case .chf: "CHF (Fr.)"
+        case .aed: "AED (د.إ)"
         }
     }
 }

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", "CZK", "CNY", "JPY", "KRW", "CAD", "AUD", "HKD", "TWD", "SGD", "INR", "CHF",
+        "USD", "GBP", "EUR", "CZK", "CNY", "JPY", "KRW", "CAD", "AUD", "HKD", "TWD", "SGD", "INR", "CHF", "AED",
     ]
 
     private let lock = NSLock()
@@ -36,6 +36,7 @@ public final class CurrencyExchange: @unchecked Sendable {
         "SGD": 1.34,
         "INR": 84.50,
         "CHF": 0.80,
+        "AED": 3.6725,
     ]
     private var lastFetchTime: Date?
 

Tests/CodexBarTests/SettingsStoreCoverageTests.swift

@@ -895,6 +895,20 @@ struct SettingsStoreCoverageTests {
         fresh.preferredCurrencyCode = "GBP"
         let reloaded = Self.makeSettingsStore(userDefaults: defaults, configStore: configStore)
         #expect(reloaded.preferredCurrencyCode == "GBP")
+
+        reloaded.preferredCurrencyCode = "AED"
+        let reloadedAED = Self.makeSettingsStore(userDefaults: defaults, configStore: configStore)
+        #expect(reloadedAED.preferredCurrencyCode == "AED")
+    }
+
+    @Test
+    func `preferred currency picker matches every supported exchange currency`() {
+        let pickerCurrencies = PreferredCurrencyOption.allCases
+            .filter { $0 != .auto }
+            .map(\.rawValue)
+
+        #expect(pickerCurrencies == CurrencyExchange.supportedCurrencies)
+        #expect(PreferredCurrencyOption.aed.label == "AED (د.إ)")
     }
 
     private static func makeSettingsStore(

Tests/CodexBarTests/UsageFormatterTests.swift

@@ -476,7 +476,7 @@ struct UsageFormatterTests {
     }
 
     @Test
-    func `currency exchange converts rates and formats correctly`() {
+    func `currency exchange converts rates and formats correctly`() throws {
         let exchange = CurrencyExchange.shared
         let epsilon = 1e-9
         // USD → USD is identity
@@ -523,6 +523,16 @@ struct UsageFormatterTests {
         #expect(explicitCZK.contains("CZK"))
         #expect(explicitCZK.contains("."))
 
+        let aedRate = try #require(exchange.rate(for: "AED"))
+        #expect(abs((exchange.convert(usdAmount: 10.0, to: "AED") ?? 0) - 10.0 * aedRate) < epsilon)
+        #expect(abs((exchange.convert(amount: 10.0, from: "AED", to: "USD") ?? 0) - 10.0 / aedRate) < epsilon)
+        #expect(abs((exchange.convert(amount: 10.0, from: "GBP", to: "AED") ?? 0)
+                - 10.0 / gbpRate * aedRate) < epsilon)
+        let explicitAED = UsageFormatter.convertedCostString(10.0, preferredCurrency: "AED", providerCurrency: "USD")
+        #expect(explicitAED == UsageFormatter.currencyString(10.0 * aedRate, currencyCode: "AED"))
+        #expect(explicitAED.hasPrefix("AED"))
+        #expect(explicitAED.range(of: #"\.\d{2}$"#, options: .regularExpression) != nil)
+
         // CHF is supported: conversion through the USD pivot works both ways.
         let chfRate = exchange.rate(for: "CHF") ?? 0.80
         #expect(abs((exchange.convert(usdAmount: 10.0, to: "CHF") ?? 0) - 10.0 * chfRate) < epsilon)
@@ -550,6 +560,8 @@ struct UsageFormatterTests {
         #expect(CurrencyExchange.requiresLiveRates(preferredCurrencyCode: " eur "))
         #expect(CurrencyExchange.requiresLiveRates(preferredCurrencyCode: "KRW"))
         #expect(CurrencyExchange.requiresLiveRates(preferredCurrencyCode: "CZK"))
+        #expect(CurrencyExchange.requiresLiveRates(preferredCurrencyCode: "AED"))
+        #expect(CurrencyExchange.requiresLiveRates(preferredCurrencyCode: " aed "))
     }
 
     @Test