refactor: use getShadowDomWarnings helper in suggest.ts

[himerus]

Summary

• Replaces inline Shadow DOM warnings array in buildStyling() with the shared getShadowDomWarnings() helper from mcp-helpers.ts
• Eliminates duplicated warning text that was flagged in PR Enhance suggest_usage to include styling guidance section #101 CodeRabbit review (🧹 Nitpick)
• Messaging is now consistent across suggest_usage, narrative, and quick-ref handlers

Test plan

• Build passes (pnpm run build — exit 0)
• Only suggest.ts modified (1 file, 2 insertions, 4 deletions)
• CI passes

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Reviewing files that changed from the base of the PR and between 470a7c3 and 7b7410e.

📒 Files selected for processing (1)

• packages/core/src/handlers/suggest.ts

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[himerus]

Closing — suggest.ts was heavily modified during the overnight anti-hallucination sprint (PRs #181, #183, #185, #187). The getShadowDomWarnings helper is already used in quick-ref.ts and the warnings in suggest.ts have been replaced with the validation nudge pattern. This change is now superseded by the sprint work.