feat: add "Top Rivalries" gaming-style marquee ticker to Compare page

[code-with-abhi-i5]

Description

This PR introduces a highly dynamic "Top Rivalries" marquee ticker at the top of the Developer Showdown page. It gives the page an immediate "Gaming Leaderboard" / "Live Broadcast" feel and solves the "blank slate" problem by giving users instantly clickable, high-profile developer match-ups to explore (e.g., Linus Torvalds vs Dan Abramov).

Fixes #3582

Pillar

• 🎨 Pillar 1 — New Theme Design
• 📐 Pillar 2 — Geometric SVG Improvement
• 🕐 Pillar 3 — Timezone Logic Optimization
• 🛠️ Other (Feature Enhancement — UX & Gamification)

Visual Preview

• Full-width infinite scrolling marquee (framer-motion) above the search bar.
• Smooth edge gradients using Tailwind (bg-gradient-to-r).
• Interactive pills with hover states and custom Lucide icons.
• Clicking a rivalry updates the URL and triggers the comparison automatically.

What's Changed

[NEW] components/TopRivalriesTicker.tsx

• Created a self-contained Marquee component powered by framer-motion (x: ['0%', '-50%']).
• Uses duplicated arrays ([...MOCK_RIVALRIES, ...MOCK_RIVALRIES]) to achieve a mathematically perfect, seamless infinite loop.
• Added handleRivalryClick which uses next/navigation router to push the ?user1=...&user2=... parameters, triggering the existing Auto-Compare useEffect in CompareClient.

[MODIFY] app/compare/CompareClient.tsx

• Wrapped the layout in a React Fragment (<>) to allow full-width bleeding of the ticker outside the max-w-5xl container.
• Adjusted padding (pt-20 lg:pt-24) to position the ticker perfectly below the fixed Navbar.

Checklist before requesting a review:

• I have read the CONTRIBUTING.md file.
• I have tested these changes locally (localhost:3000/compare).
• I have run npm run format and npm run lint locally and resolved all errors (CI will fail otherwise).
• My commits follow the Conventional Commits format (feat: add Top Rivalries ticker...).
• I have started the repo.
• I have made sure that I have only one commit to merge in this PR.
• Marquee animation is smooth and seamless (no jitter at the loop point).
• Clicking a rivalry correctly updates the URL and triggers the comparison fetch.
• (Recommended) I joined the CommitPulse Discord community for contributor discussions, mentorship, and faster PR support.

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