fix: issue #146 - make trial always says days on every trial banner in the app

Automated fix by Tony CI v3.
Refs #146

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

Shared/Views/IAPWarningView.swift

@@ -22,12 +22,12 @@ struct IAPWarningView: View {
                 Image(systemName: "clock")
                     .foregroundColor(.orange)
 
-                if let expirationDate = iapManager.trialExpirationDate, expirationDate > Date() {
+                if iapManager.daysLeftInTrial > 0 {
                     Text(String(localized: "iap_warning_view_title"))
                         .font(.body)
                         .foregroundColor(textColor)
 
-                    Text(expirationDate, style: .relative)
+                    Text("\(iapManager.daysLeftInTrial) days")
                         .font(.body)
                         .bold()
                         .foregroundColor(.orange)