Fix placeholder contrast and toggle design in dark mode

[gaganveerbawa]

Fix: Placeholder Contrast & Dark Mode Toggle Design

Description

• Improved the contrast of the placeholder text in dark mode to make it more visible and user-friendly.

Changes Made

• Adjusted placeholder text colour to black for better contrast based on both themes.

Testing

• Verified placeholder text visibility in both light and dark modes.

Issue Reference
Closes #812

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Screenshots

Dark Mode

Light Mode

Earlier Dark Mode

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