readme: theme-aware logo for GitHub dark mode

[andrewwormald]

Summary

• Wraps the README logo in a <picture> element using GitHub's prefers-color-scheme media query, so logo_dark.svg is shown in dark mode and logo.svg in light mode.
• Adds logo/logo.svg and logo/logo_dark.svg to the repo.

Test plan

• View the README on GitHub with light theme — should show dark-on-light logo
• View the README on GitHub with dark theme — should show light-on-dark logo

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Updated project logo to automatically switch between light and dark variants based on system preferences, improving visual consistency across different display modes.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: a3eebfcf-d766-497c-920e-7118070e8723

📥 Commits

Reviewing files that changed from the base of the PR and between 2156b95 and bc6494f.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README.md file has been updated to implement theme-aware logo rendering. The change replaces a single <img> element with a <picture> element containing a <source> tag that serves a dark-mode-specific logo (logo_dark.svg) when the user's system prefers dark colour schemes, whilst retaining logo.svg as the default fallback image.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A logo that shifts with the night,
From light to dark, what a sight!
With picture elements so fine,
Both themes shall beautifully align,
README's magic now shines bright! ✨

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/readme-logo-dark-theme

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud