fix: use clickable thumbnail for demo video in README

[rohitg00]

Summary

• GitHub doesn't render <video> tags in README markdown
• Replace with clickable thumbnail image (assets/demo-thumbnail.png) that links to the raw mp4
• Clicking the thumbnail downloads/plays the demo video

Test plan

• Thumbnail renders on GitHub
• Click opens the mp4 file

Summary by CodeRabbit

• Documentation
  • Updated README presentation: replaced embedded video with a linked thumbnail image and caption.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 7cd4fdfc-5851-4986-bef4-98150ecb6b92

📥 Commits

Reviewing files that changed from the base of the PR and between b9d7ea9 and 843d1ee.

⛔ Files ignored due to path filters (1)

• assets/demo-thumbnail.png is excluded by !**/*.png

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README was updated to replace a video element with a linked thumbnail image and caption for demonstrating the project. This is purely a documentation presentation change with no modifications to functional code or logic.

Changes

Cohort / File(s)	Summary
Documentation README.md	Replaced video element embedding with linked thumbnail image and caption for demo media presentation.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• docs: add demo video to README #71: Related update to README's demo media embedding, transitioning between video element and thumbnail image representations.

Poem

🐰 A carrot-bright thumbnail appears,
Where video once played with cheers,
A linked image, neat and small,
Guides readers through it all! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'fix: use clickable thumbnail for demo video in README' directly and accurately describes the main change—replacing the video element with a clickable thumbnail image for the README.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/readme-video-display

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