Introduced a `Color` property to `ReceiverDraft` and `SignatureFieldDraft` models, enabling dynamic color assignment from a predefined palette (`ReceiverPalette`). Updated the UI to reflect receiver-specific colors in the sender-receiver chips, placement mode hint bar, and signature placement button.
Refactored PDF rendering logic to dynamically derive visual styles (fill, border, and text colors) from receiver colors. Added a `HexToXColor` utility for converting hex color strings to `PdfSharp.Drawing.XColor`.
Removed hardcoded visual styles and replaced them with dynamic, receiver-specific styling. Simplified receiver addition logic to automatically assign colors from the palette. These changes improve clarity and maintainability while enhancing the user experience.
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