Minor improvements and fixes.

In the latest update, we have made a number of improvements to make your work with electronic signatures even more efficient.

• We've added a new feature that allows you to accurately specify the installation date of a signature on an employee's card
• We have improved the interface of the signature editing card
• Improved the signature duplication option, now you can copy the signature with all the settings
• We have improved the framing option with the user's avatar

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