Fix missing navbar on authentication pages

[SRSoham]

Description

This PR fixes the issue where the navigation bar disappeared on authentication pages.

Changes Made

• Added navbar to Login and Signup pages
• Fixed navbar positioning using fixed layout
• Added proper top spacing to prevent content overlap
• Maintained responsive behavior and theme toggle support

Issue Fixed

Fixes #443

Screenshots

(Add before/after screenshots here)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: bc4f7b33-a82f-4e25-b872-84f7fd5c5287

📥 Commits

Reviewing files that changed from the base of the PR and between 7413e5f and c876d4a.

📒 Files selected for processing (4)

• src/components/Navbar.tsx
• src/pages/Activity.tsx
• src/pages/Login/Login.tsx
• src/pages/Tracker/Tracker.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[github-actions]

🎉 Thank you @SRSoham for your contribution. Please make sure your PR follows https://github.com/GitMetricsLab/github_tracker/blob/main/CONTRIBUTING.md#-pull-request-guidelines

[SRSoham]

Hi @mehul-m-prajapati ,
Implemented the requested navbar fix for authentication pages and ensured proper spacing/layout across pages. All checks are passing now. Looking forward to the review.

[github-actions]

🎉🎉 Thank you for your contribution! Your PR #448 has been merged! 🎉🎉