✨(frontend) improve mobile UX by showing subdocs count

[Ovgodd]

Purpose

Improve mobile user experience by indicating when a document or a subdocument has children.

issue : 1314

Proposal

• [x] Display the number of sub-documents in mobile view only and only if they exist
• [x] Adjust the UI to accommodate the new child count information
• [x] Create a DocHeaderInfo component to encapsulate related logic and rendering

[github-actions[bot]]

Size Change: +197 B (0%)

Total Size: 4.07 MB

Filename	Size	Change
apps/impress/out/_next/static/ace1e28c/_buildManifest.js	0 B	-884 B (removed)	🏆
apps/impress/out/_next/static/4036ff10/_buildManifest.js	883 B	+883 B (new file)	🆕

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