fix(shared): preserve image blocks during markdown/html round-trip

[rebelchris]

Summary

• fix markdown-to-HTML conversion so standalone markdown image lines render as top-level <img /> blocks instead of being wrapped in <p>
• add/strengthen markdown conversion tests to cover standalone image round-trips, image-between-paragraphs, and inline image behavior

Key Decisions

• treat only full-line markdown image syntax as standalone blocks using an anchored regex, so inline images in text remain paragraph content
• reuse existing inlineMarkdownToHtml conversion for standalone image rendering to avoid duplicated parsing/escaping logic
• tighten the existing image assertion from .toContain() to .toBe() to prevent masking paragraph-wrapping regressions

Closes ENG-779

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Created by Huginn 🐦‍⬛

Preview domain

https://eng-779-images-become-broken-lin.preview.app.daily.dev

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Project	Deployment	Actions	Updated (UTC)
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