The MarkdownBody component now accepts an optional resolveImageSrc callback
that maps relative image paths (like images/org-chart.png) to base64 data URLs
from the portable file entries. This fixes the export README showing a broken
image instead of the org chart PNG.
Applied to both CompanyExport and CompanyImport preview panes.
Co-Authored-By: Paperclip <noreply@paperclip.ing>