Refactor `EnvelopeSenderPage.razor` to focus on UI composition
and state orchestration, avoiding heavy domain logic. Adopt a
modular page architecture to improve maintainability by splitting
large pages into smaller subcomponents and centralizing shared
logic. Conduct a performance review of sender/receiver flows to
optimize route transitions, component lifecycle behavior, and
loading-state correctness.
Audit `Services` for redundant request/payload remapping and
eliminate unnecessary transformations. Centralize dependency
injection registrations into dedicated extension methods to
reduce startup composition sprawl.
Refactor `PdfRenderController.cs` and its client service contract
to replace JSON/base64 transport for PDF rendering with binary
streaming (`application/octet-stream` or multipart). Add a `TODO`
comment to highlight the need for further optimization of large
PDF handling to reduce payload size and memory pressure.
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