Replaced inline styles with reusable CSS classes to improve maintainability, readability, and scalability. Updated the layout and styling of key components, including the action bar, title and message inputs, PDF metadata display, and buttons. Introduced a `DxAccordion` for envelope settings and redesigned the empty state and save result dialog. Added dynamic styling using CSS variables and centralized styles in `envelope-viewer.css`. Removed redundant inline styles and improved overall UI consistency.
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