fix: handle protected footer navigation

[gitsofyash]

📌 Description

Fixed footer navigation for protected app routes. Footer links now use React Router navigation, logged-out users are redirected to the login page instead of Not Found, and route changes scroll to the top so the login form is visible immediately.

🔗 Related Issue

Closes #683

🛠 Changes Made

• Replaced footer protected route anchors with React Router Link components.
• Preserved the originally requested protected route and redirect users there after login.
• Added route-change scroll reset so footer link redirects show the login form immediately.
• Hardened auth token handling to avoid malformed stale tokens being attached to login/signup requests.

📸 Screenshots (if applicable)

N/A

✅ Checklist

• Code runs locally
• Followed project structure
• No console errors
• Properly tested changes
• Linked the issue

🚀 Notes for Reviewers

Please review the protected footer navigation flow for logged-out users, especially Dashboard, Tasks, and Routine Builder redirects from the footer.

[gitsofyash]

Hi @aryandas2911, I have resolved the merge conflicts and updated the branch.

The PR is ready for review. Could you please approve the workflow run so CI can start?

Verified locally:

• npm.cmd run lint
• npm.cmd run build

Thanks!