Refactored the code to improve performance by parallelizing independent post-authentication service calls using `Task.WhenAll`. This reduces the initial page load time by avoiding redundant HTTP calls and reusing pre-fetched data.
- Moved `ThemeService.LoadFromServerAsync` to a separate task.
- Parallelized service calls for theme, logos, envelope types, and envelopes.
- Introduced `ApplyEnvelopeResultAsync` to process envelope data.
- Updated `LoadEnvelopesAsync` to reuse pre-fetched envelope data.
- Removed redundant HTTP calls to streamline initialization logic.
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