Improved interactive login flow for feature cards using NextAuth signIn()

[priyakumari0104]

Changes Made
Made landing page feature cards clickable
Added a custom interactive /login-required page
Improved authentication onboarding UI/UX
Added animated and responsive login prompt design
Replaced direct /api/auth/signin/github redirect with NextAuth signIn("github")
Fixed GitHub OAuth redirect loop issue mentioned in review
Technical Improvements
Added reusable GithubSignInButton component
Used signIn("github", { callbackUrl: "/dashboard" }) from next-auth/react
Improved hover animations and transitions
Enhanced accessibility and user interaction
Result

Users now get a smoother and more interactive authentication experience when clicking feature cards, while also preventing circular redirect issues in the GitHub login flow.

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[github-actions]

GSSoC Label Checklist 🏷️

@Priyanshu-byte-coder — please apply the appropriate labels before merging:

Difficulty (pick one):

• level:beginner — 20 pts
• level:intermediate — 35 pts
• level:advanced — 55 pts
• level:critical — 80 pts

Quality (optional):

• quality:clean — ×1.2 multiplier
• quality:exceptional — ×1.5 multiplier

Validation (required to score):

• gssoc:approved — counts for points
• gssoc:invalid / gssoc:spam / gssoc:ai-slop — does not score

Type labels (type:*) are auto-detected from files and title. Review and adjust if needed.
Points formula: (difficulty × quality_multiplier) + type_bonus

[Priyanshu-byte-coder]

Hi! This PR has a merge conflict with main. Please rebase onto the latest main branch and resolve conflicts before we can review further.