refactor: enhance modal component structure and styling

[Souradip121]

Description

This PR fixes #6292

Notes for Reviewers

Signed commits

• Yes, I signed my commits.

[l5io]

🚀 Preview for commit 00a8240 at: https://67ddbf4b017ffe286b34e41d--layer5.netlify.app

[l5io]

🚀 Preview for commit 97afb04 at: https://67e03a9684018c4a5a759f22--layer5.netlify.app

[vishalvivekm]

@Souradip121
please fix failing Eslist checks
https://github.com/layer5io/layer5/actions/runs/14020899270/job/39252725942?pr=6337

Also add it to agenda items for weekly websites meeting [Monday, 24th March | 5:30 PM IST]
meeting minutes.

[Souradip121]

I am facing issues, I have ran using GATSBY_CPU_COUNT=2 make site and over github codespaces with 16GB RAM, with details as follows

Then after running with command GATSBY_CPU_COUNT=2 make site

I really want to contribute, anyone who can help kindly help I have read both blogs
https://discuss.layer5.io/t/problems-with-setting-up-layer5-for-development/6613
https://discuss.layer5.io/t/problems-with-running-local-development-server-for-layer5-development/6780

[l5io]

🚀 Preview for commit 3f70933 at: https://67e1c3f417b1b30e64351e3a--layer5.netlify.app

[Souradip121]

I have updated the PR @vishalvivekm you can check