feat: add dark-mode fix category to suggest_fix

[himerus]

Summary\n\n- Adds dark-mode fix type to suggest_fix covering both issue rules from check_dark_mode_patterns\n- theme-scope-standard-property: generates CSS custom property replacement with tokenPrefix support\n- theme-scope-shadow-piercing: suggests ::part() or custom properties with host-only selector\n- 4 new tests covering all dark mode fix paths\n\n## Test plan\n- [x] All 39 suggest-fix tests pass\n- [x] Standard property fix uses component tag name for token naming\n- [x] tokenPrefix override works correctly\n- [x] Shadow piercing fix shows both ::part() and custom property options\n\n🤖 Generated with Claude Code

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⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

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Run ID: de9c05ab-1e4c-4df4-ac79-0a9e2d090c82

📥 Commits

Reviewing files that changed from the base of the PR and between f66f36d and 77c4b1d.

📒 Files selected for processing (6)

• .changeset/suggest-fix-dark-mode.md
• packages/core/src/handlers/css-file-validator.ts
• packages/core/src/handlers/quick-ref.ts
• packages/core/src/handlers/styling-preflight.ts
• packages/core/src/handlers/suggest-fix.ts
• tests/handlers/suggest-fix.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

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

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