[Feature] Add support for dropcaps

[sophiixyz]

Add support for drop-cap paragraph styling

I'd like to propose adding support for drop-cap paragraphs in Leaflet.

For long-form and literary publications, it would be useful to style the first letter of selected paragraphs as a large drop cap, e.g.:

p.dropCap::first-letter {
    font-size: 5.9em;
    float: left;
    margin-left: 0.05em;
    padding-right: 0.13em;
    line-height: 1;
    font-style: normal;
}

p.dropCap {
    text-indent: 0;
    margin-top: 0.5em;
}

Currently, achieving this appears to require injecting custom CSS, which isn't exposed as a publication-level customization option.

Proposed approach

Rather than adding arbitrary CSS injection, I think this could work nicely as a paragraph style in the editor, for example:

• Normal paragraph
• Drop cap

The selected paragraph could then be rendered with an appropriate class/attribute, allowing Leaflet's theme styles to control the appearance.

Ideally, the drop-cap typography would integrate with the publication's existing typography/theme settings rather than requiring authors to specify a particular font stack.

Would this be a feature the maintainers would be interested in accepting?
I'm happy to fork the project and open a PR for this if needed.