A markdown-preview reading stylesheet, contributed as a global extension so
every workspace gets it — no per-repo settings, no per-repo CSS files.
Why an extension and not the markdown.styles setting
markdown.styles pointed at the same CSS by absolute path and failed with
"Could not load 'markdown.styles'" — that is not a missing file, it is how
the preview webview works: it only loads resources under extension
contributions or open workspace folders, so a path outside the workspace is
refused outright. Contributing the stylesheet through an extension sidesteps
the restriction entirely.
What it styles
See preview.css — a comfortable reading measure, calmer
heading scale, and code blocks that read as blocks. Edit the CSS and rebuild
the extension to see changes; the shipped stylesheet is the built artifact.
