fix: correct sign-in container alignment and footer dark theme rendering

[Niteshagarwal01]

Summary

This Pull Request resolves visual layout inconsistencies found on the authentication and main landing pages, ensuring proper alignment and theme consistency across the application UI.

Closes #1087

Type of Change

• Bug fix
• New feature
• Documentation update
• Refactor / code cleanup

Changes Made

• src/app/auth/signin/page.tsx: Addressed the layout bug where the heading appeared to escape the authentication container by strictly enforcing a column-based flex layout (flex-col items-center) on the parent div. This ensures the logo, h1 heading, and all subsequent elements stay properly aligned and constrained within the container's bounds.
• src/components/Footer.tsx: Fixed the white background rendering issue by explicitly passing the dark class to the footer element along with the bg-[var(--background)] utility and configuring a relative wrapper. This forces the footer to natively follow the application's dark mode variables, achieving visual consistency with the rest of the UI.

How to Test

Steps for the reviewer to verify this works:

1. Pull this branch and run the application locally (npm run dev).
2. Navigate to the /auth/signin route.
3. Verify that the "WELCOME BACK." heading and DEVTRACK logo are perfectly aligned inside the authentication container without any overflow.
4. Navigate to the main/landing page (/) and scroll to the bottom.
5. Verify that the footer background has a dark background and correctly aligns with the dark-themed design of the page.

Checklist

• Linked issue in summary
• npm run lint passes locally
• No TypeScript errors (npm run type-check)
• Self-reviewed the diff
• Added/updated tests if applicable (N/A)

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