Update envelope view title logic for confirm state

Refined the logic for setting ViewData["Title"] in ShowEnvelope.cshtml. Now, if the envelope requires read and confirm, the title displays "Confirm Document" instead of just "Sign Document" or "View Document", providing clearer context for users.

EnvelopeGenerator.Web/Views/Envelope/ShowEnvelope.cshtml

@@ -9,6 +9,7 @@
 @using EnvelopeGenerator.Web.Extensions
 @using Newtonsoft.Json
 @using Newtonsoft.Json.Serialization
+@using EnvelopeGenerator.Domain.Interfaces
 @model EnvelopeReceiverDto;
 @{
     var userCulture = ViewData["UserCulture"] as Culture;
@@ -24,7 +25,11 @@
     if (ViewData["IsReadOnly"] is bool isReadOnly_bool)
         isReadOnly = isReadOnly_bool;
 
-    ViewData["Title"] = isReadOnly ? _localizer.ViewDoc() : _localizer.SignDoc();
+    ViewData["Title"] = isReadOnly
+        ? _localizer.ViewDoc()
+        : envelope.IsReadAndConfirm()
+            ? _localizer.ConfirmDoc()
+            : _localizer.SignDoc();
 }
 <div class="envelope-view">
     @if (!isReadOnly)