refactor(vscode): reuse Markdown fence formatting

[marius-kilocode]

What Problem This Solves

Browser feedback and review comments duplicate the same Markdown fence construction.

Why This Change Was Made

Export the existing review-comment helper and reuse it through browser feedback’s existing import. The six-line helper body is identical in both modules and remains unchanged, including backtick-run handling. Nearby escaping and validation logic stays separate.

User Impact

No behavior change is intended. The PR removes 7 net production lines across two files, with no new files, dependencies, or test code.

Evidence

• 82 existing review-comment, PR-comment, and browser-feedback tests passed.
• Host/webview typecheck, lint, knip, build:check, formatting, duplication guard, and diff checks passed.
• Duplication report unchanged at 27 pairs, 521 lines, 3646 tokens. This smaller clone is below the scanner threshold; the allowlist is untouched.
• Exact overlap was inspected: the pending inline-review PR changes other sections of review-comments.ts, not this fence helper.
• Pure formatter reuse is covered through existing tests; no UI session or model requests were needed.

No changeset is needed for this internal behavior-preserving refactor.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• packages/kilo-vscode/src/shared/browser-feedback.ts
• packages/kilo-vscode/src/shared/review-comments.ts

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_{Reviewed by grok-4.6 · Input: 40.8K · Output: 3.4K · Cached: 205.7K}

_{Review guidance: REVIEW.md from base branch main}