feat: add common mistakes section to component narrative

[himerus]

Summary

• Adds a component-specific "Common mistakes" section to get_component_narrative output
• Lists valid CSS part names with warning that others silently fail
• Warns when component has no CSS parts (use properties only) or no CSS API at all
• Flags custom events (with hyphens) that won't work with React onXxx props
• Reminds agents to validate CSS with styling_preflight

Test plan

• 5 new tests: valid parts listed, no-parts warning, no-CSS-API warning, React event warning, preflight reminder
• All 20 narrative tests pass
• Build, type-check, lint all 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: f5938b36-1f73-4f1d-bd67-5a13fcd44f3c

📥 Commits

Reviewing files that changed from the base of the PR and between b4d8aee and ce9ed84.

📒 Files selected for processing (3)

• .changeset/narrative-common-mistakes.md
• packages/core/src/handlers/narrative.ts
• tests/handlers/narrative.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/narrative-common-mistakes

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