fix(signature): add dark mode support for signature drawing

[AhmadBilalAmjad]

Issue

The signature input component was originally hard coded to always use black (strokeStyle = 'black'`) for the signature drawing, making it invisible in dark mode, where the background is dark.

Problem Details

1. The original code had a fixed stroke color.
2. This caused poor visibility issues:

• In dark mode, black signatures were difficult or impossible to see against dark backgrounds
• No consideration for user's theme preferences
• Inconsistent with the system's theming system

Fix

The fix implements dynamic color switching to ensure the signature remains visible regardless of the theme setting, using:

• White (#ffffff) for dark mode
• Black (#000000) for light mode
• Show the right signature color for the system's preferred theme

[vercel]

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[hasanharman]

Hi @AhmadBilalAmjad, Great catch, can you also fix the /components parts. I think you deserve this complete fix. After that I can approve. Thank you for your work.

[AhmadBilalAmjad]

Hi @hasanharman, Thanks for the kind words. It is already working there because I have fixed the component itself. Below are the screenshots:-