Update sidebar upgrade card to Premium branding with centered crown layout.

Co-authored-by: Cursor <cursoragent@cursor.com>

Reddit App/Views/SidebarView.swift

@@ -97,11 +97,11 @@ struct SidebarView: View {
 
     private var upgradeCard: some View {
         VStack(alignment: isPremium ? .center : .leading, spacing: 8) {
-            HStack(spacing: 6) {
+            VStack(spacing: 4) {
                 Image(systemName: "crown.fill")
-                    .font(.system(size: 12))
+                    .font(.system(size: 14))
                     .foregroundStyle(AppTheme.accentYellow)
-                Text(isPremium ? "Reddora Pro" : "Upgrade to Pro")
+                Text(isPremium ? "Reddora Premium" : "Upgrade to Premium")
                     .font(.system(size: 12, weight: .semibold))
                     .foregroundStyle(AppTheme.textPrimary)
             }