Add Romanian Leu (RON) currency support to menubar and GNOME extension

The CLI already supports any ISO 4217 code dynamically via Intl.NumberFormat,
but the macOS menubar app (SupportedCurrency enum) and GNOME extension
(hardcoded CURRENCIES array) had fixed lists. RON was missing from both.

- Add RON case to SupportedCurrency enum + displayName in AppStore.swift
- Add RON symbol override ('lei') in CurrencyState.swift
- Add RON entry to CURRENCIES array in gnome/indicator.js

gnome/indicator.js

@@ -63,6 +63,7 @@ const CURRENCIES = [
   { code: 'MXN', symbol: 'MX$' },
   { code: 'ZAR', symbol: 'R ' },
   { code: 'DKK', symbol: 'kr ' },
+  { code: 'RON', symbol: 'lei ' },
   { code: 'CNY', symbol: '¥' },
 ];
 

mac/Sources/CodeBurnMenubar/AppStore.swift

@@ -1188,7 +1188,7 @@ final class AppStore {
 }
 
 enum SupportedCurrency: String, CaseIterable, Identifiable {
-    case USD, GBP, EUR, AUD, CAD, NZD, JPY, CNY, CHF, INR, BRL, SEK, SGD, HKD, KRW, MXN, ZAR, DKK
+    case USD, GBP, EUR, AUD, CAD, NZD, JPY, CNY, CHF, INR, BRL, SEK, SGD, HKD, KRW, MXN, ZAR, DKK, RON
     var id: String { rawValue }
     var displayName: String {
         switch self {
@@ -1210,6 +1210,7 @@ enum SupportedCurrency: String, CaseIterable, Identifiable {
         case .MXN: "Mexican Peso"
         case .ZAR: "South African Rand"
         case .DKK: "Danish Krone"
+        case .RON: "Romanian Leu"
         }
     }
 }

mac/Sources/CodeBurnMenubar/CurrencyState.swift

@@ -60,7 +60,8 @@ final class CurrencyState: Sendable {
         "CHF": "CHF",
         "SEK": "kr",
         "DKK": "kr",
-        "ZAR": "R"
+        "ZAR": "R",
+        "RON": "lei"
     ]
 }