Refactor the structure and class names in `CreateEnvelopeWizardPopup.razor` to improve the layout and alignment of receiver rows:
- Replace `sender-create-wizard__receiver-item` with `sender-create-wizard__receiver-row`.
- Replace `sender-create-wizard__form-grid` with `sender-create-wizard__receiver-fields-stack`.
Update `sender-page.css` to introduce new classes:
- Add `.sender-create-wizard__receiver-row` for flex layout with proper alignment and spacing.
- Add `.sender-create-wizard__receiver-fields-stack` for grid-based field organization.
Adjust styles for responsiveness, including column layouts for smaller contexts. These changes enhance the visual structure and responsiveness of the receiver rows.
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