TekH 5ee9efbcd9 Refactor user-related classes and properties
- Added parameterless and user-initializing constructors to `EGUser`.
- Removed unnecessary `using` directives and `#if NETFRAMEWORK` from `EGUser.cs`, `Envelope.cs`, and `EnvelopeHistory.cs`.
- Replaced `EGUser` property with `User` in `Envelope.cs` and `EnvelopeHistory.cs`.
- Retained default value for `CURRENT_WORK_APP` in `Envelope.cs`.
2025-06-26 16:21:22 +02:00
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