Added `EnvelopeSenderPage.razor` as a placeholder for the sender's dashboard.
Updated `Index.razor` to include a homepage with a hero header, feature badges,
and dynamic description rendering using JavaScript interop.
Implemented `LoginReceiverPage.razor` for secure document access via access code,
with error handling and user feedback for various login states.
Implemented `LoginSenderPage.razor` for sender authentication, including error
handling, password visibility toggle, and redirection to the sender dashboard.
TekH
6c40c48ac8