feat: add fix suggestions for dark mode theme issues

[himerus]

Summary

• Extends suggest_fix to handle mixed-token-hardcoded issues (wraps hardcoded value in var())
• Extends suggest_fix to handle dark-mode-shadow-invisible issues (suggests shadow token)
• Both respect tokenPrefix for library-agnostic suggestions

Test plan

• 3 new tests: mixed-token-hardcoded fix, shadow-invisible fix, tokenPrefix on shadow fix
• All 35 suggest-fix tests pass
• Type checks clean

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: c6a9ad16-814f-443b-ba2f-555401f00b0e

📥 Commits

Reviewing files that changed from the base of the PR and between c1e5f29 and fc95c1c.

📒 Files selected for processing (4)

• .changeset/suggest-fix-dark-mode.md
• packages/core/src/handlers/suggest-fix.ts
• packages/core/src/handlers/validation-summary.ts
• tests/handlers/suggest-fix.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

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

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