fix(markdown): prevent image links from trapping users

[rebelchris]

Summary

• Prevent markdown image taps and image-target links from navigating away from the app shell by opening the shared image lightbox instead.
• Preserve badge-style linked images by allowing image anchors that point to non-image pages to follow the link once.
• Add image URL classification coverage for file extensions, query/fragment URLs, relative/protocol-relative URLs, and daily.dev media/Cloudinary hosts.

Verification

• NODE_ENV=test corepack pnpm --filter @dailydotdev/shared exec jest src/components/Markdown.spec.tsx src/lib/image.spec.ts --runInBand
• corepack pnpm --filter @dailydotdev/shared exec eslint src/components/Markdown.tsx src/components/Markdown.spec.tsx src/lib/image.ts src/lib/image.spec.ts --max-warnings 0
• corepack pnpm typecheck:strict:changed
• NODE_ENV=test corepack pnpm --filter webapp test

Issue: https://linear.app/dailydev/issue/ENG-2110/feedback-ux-issue-user-cannot-close-or-navigate-back-after-clicking-on

Closes ENG-2110

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Created by Huginn 🐦‍⬛

Preview domain

https://eng-2110-feedback-ux-issue-user.preview.app.daily.dev

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Project	Deployment	Actions	Updated
daily-webapp	Ready	Preview	Sep 22, 2026 6:59am UTC