fix: pin RelativeDateTimeFormatter to en_US to stop mixed-locale labels

Sources/CodexBar/Date+RelativeDescription.swift

@@ -4,6 +4,7 @@ enum RelativeTimeFormatters {
     @MainActor
     static let full: RelativeDateTimeFormatter = {
         let formatter = RelativeDateTimeFormatter()
+        formatter.locale = Locale(identifier: "en_US")
         formatter.unitsStyle = .full
         return formatter
     }()

Sources/CodexBar/PreferencesGeneralPane.swift

@@ -152,6 +152,7 @@ struct GeneralPane: View {
         }
         if let lastAttempt = self.store.tokenLastAttemptAt(for: provider) {
             let rel = RelativeDateTimeFormatter()
+            rel.locale = Locale(identifier: "en_US")
             rel.unitsStyle = .abbreviated
             let when = rel.localizedString(for: lastAttempt, relativeTo: Date())
             return Text("\(name): last attempt \(when)")

Sources/CodexBarCore/Providers/Augment/AugmentStatusProbe.swift

@@ -226,6 +226,7 @@ public struct AugmentStatusSnapshot: Sendable {
 
     private static func formatResetDate(_ date: Date) -> String {
         let formatter = RelativeDateTimeFormatter()
+        formatter.locale = Locale(identifier: "en_US")
         formatter.unitsStyle = .full
         return formatter.localizedString(for: date, relativeTo: Date())
     }

Sources/CodexBarCore/UsageFormatter.swift

@@ -76,6 +76,7 @@ public enum UsageFormatter {
         if let hours = Calendar.current.dateComponents([.hour], from: date, to: now).hour, hours < 24 {
             #if os(macOS)
             let rel = RelativeDateTimeFormatter()
+            rel.locale = Locale(identifier: "en_US")
             rel.unitsStyle = .abbreviated
             return "Updated \(rel.localizedString(for: date, relativeTo: now))"
             #else

Sources/CodexBarWidget/CodexBarWidgetViews.swift

@@ -701,6 +701,7 @@ enum WidgetFormat {
 
     static func relativeDate(_ date: Date) -> String {
         let formatter = RelativeDateTimeFormatter()
+        formatter.locale = Locale(identifier: "en_US")
         formatter.unitsStyle = .short
         return formatter.localizedString(for: date, relativeTo: Date())
     }

Tests/CodexBarTests/UsageFormatterTests.swift

@@ -21,9 +21,11 @@ struct UsageFormatterTests {
         let now = Date()
         let fiveHoursAgo = now.addingTimeInterval(-5 * 3600)
         let text = UsageFormatter.updatedString(from: fiveHoursAgo, now: now)
-        #expect(text.contains("Updated"))
-        // Check for relative time format (varies by locale: "ago" in English, "전" in Korean, etc.)
-        #expect(text.contains("5") || text.lowercased().contains("hour") || text.contains("시간"))
+        #expect(text.hasPrefix("Updated "))
+        // Output must stay in English regardless of the host system locale,
+        // matching the surrounding hardcoded English UI labels.
+        #expect(text.contains("5"))
+        #expect(text.lowercased().contains("ago"))
     }
 
     @Test