Fix Ticker Default Rivalries Labeling

[nyxsky404]

Description

Fixes #8611

Default Compare ticker entries are hardcoded sample pairs, but the UI presented them like live rankings. Added an "Example comparisons" label and region aria-label when the built-in mock list is shown. Custom rivalry lists keep the existing "Top rivalries" labeling.

Pillar

• Pillar 1 — New Theme Design
• Pillar 2 — Geometric SVG Improvement
• Pillar 3 — Timezone Logic Optimization
• Other (Bug fix, refactoring, docs)

Visual Preview

N/A — labeling change on Compare ticker.

Checklist before requesting a review:

• I have read the CONTRIBUTING.md file.
• I have tested these changes locally (localhost:3000/api/streak?user=YOUR_USERNAME).
• 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 (e.g., feat(themes): ..., fix(calculate): ...).
• I have updated README.md if I added a new theme or URL parameter.
• I have started the repo.
• I have made sure that i have only one commit to merge in this PR.
• The SVG output matches the CommitPulse "premium quality" aesthetic standard (no raw elements, smooth animations, correct fonts).
• (Recommended) I joined the CommitPulse Discord community for contributor discussions, mentorship, and faster PR support.

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[retenta-bot]

This pull request addresses issue #8611 by improving the clarity of the ticker UI. The default compare ticker entries are now labeled as 'Example comparisons', which helps distinguish them from live rankings. This change is a small but important enhancement to user experience. It aligns with our ongoing efforts to improve UI clarity, similar to past decisions like adding a dark/light preview background toggle. Thank you for your contribution!

[github-actions]

📦 Next.js Bundle Size Report (Gzipped Sizes)

Asset	PR Size	Base Size	Difference	Status
static/chunks/app/compare/page-[hash].js	17.80 KB	17.70 KB	+0.10 KB (+0.56%)	🔴 Regression

📊 Summary of Totals

Category	PR Size	Base Size	Difference
Total JS	4939.70 KB	4939.27 KB	+0.43 KB (+0.01%)
Total CSS	348.51 KB	348.46 KB	+0.05 KB (+0.01%)