Theme toggle mode badge + one-line hero

[bharvey88]

What does this change?

Two small header/hero tweaks:

• Theme toggle mode badge — the Apollo dog alone didn't read as a light/dark control, so it now carries a small sun/moon/auto badge at its corner (system 🌓, dark 🌙, light ☀️) that tracks the current mode. Clicking still cycles System → Dark → Light.
• Hero on one line — the intro sentence had a max-width: 60ch cap that wrapped it onto two lines; dropped the cap so it stays on one line on desktop (still wraps responsively on narrow screens).

Checklist

• Playwright tests pass locally (cd tests && npx playwright test) (20 passed, 1 intentional skip)
• Any new runtime file/dir is added to the cp list in .github/workflows/pages.yml (n/a: edits only)
• No new build step, framework, or runtime CDN dependency
• If devices.json changed: python scripts/validate_registry.py passes (devices.json unchanged)

🤖 Generated with Claude Code

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: cc1dbd29-f479-40af-b521-8d5eab07967f

📥 Commits

Reviewing files that changed from the base of the PR and between 1bcc378 and 9e95a5e.

📒 Files selected for processing (3)

• css/style.css
• index.html
• js/theme.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/theme-badge-hero-line

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