chore: Update contact form style and button appearance

[adityas-github]

🛠️ Fixes Issue

Closes #836

👨‍💻 Changes proposed

• Enhanced the .Cbtn component with a new gradient background.
• Improved font size and padding for better readability and spacing.
• Added dynamic hover effects, including a gradient change, shadow enhancement, and transform scaling.
• Refined the active state to remove shadow and reset transform.
• Indicated the disabled state with reduced opacity.
• Applied smoother transition effects for better user interaction.

✔️ Check List (Check all the applicable boxes)

• My code follows the code style of this project.
• This PR does not contain plagiarized content.
• The title of my pull request is a short description of the requested changes.

📄 Note to reviewers

Please review the changes to the .Cbtn component to ensure they align with the overall project theme and provide an improved user experience.

📷 Screenshots

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After

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[adityas-github]

@SauravMukherjee44
kindly please check this and merge it.