Add Prettier config and global color variables

[Pratikshya32]

Summary

• Added a Prettier configuration to standardize formatting across the project.
• Introduced reusable global CSS color variables for the app palette.
• Mapped those variables into Tailwind semantic colors for consistent future usage.

Validation

• Ran git diff --check successfully.
• Attempted dependency installation for full project checks, but the install timed out in the local environment.

Closes #24

[vercel]

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[coder-zs-cse]

Feedbacks

• did you run the prettier check and write command?
• you need to add the prettier scripts in package json
• you need to add the prettierignore file to avoid scannign files like node modules
• can we also add prettier settings for tailwind class sorting
• do we need to add a github action for prettier?