feat: add dark mode example to buildCssSnippet

[himerus]

Summary\n\n- Adds dark mode section to buildCssSnippet showing correct theme-scoped custom property pattern\n- Includes explicit WRONG comment demonstrating the anti-pattern (standard properties on host)\n- Shows both .dark and [data-theme=\"dark\"] selector patterns\n\n## Test plan\n- [x] All 33 styling-diagnostics tests pass\n- [x] All 30 styling-preflight tests pass\n- [x] Snippet only generated for components with CSS custom properties\n\n🤖 Generated with Claude Code

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Run ID: cd789e96-6b95-4e1c-8214-d35939a2dd22

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Reviewing files that changed from the base of the PR and between d8e1412 and 1a3787a.

📒 Files selected for processing (3)

• .changeset/dark-mode-snippet.md
• packages/core/src/handlers/styling-diagnostics.ts
• tests/__fixtures__/benchmark-results/latest-benchmark.json

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• Create PR with unit tests
• Commit unit tests in branch feat/dark-mode-snippet

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