v0.28.1-beta.0

Delta since previous beta (v0.28.0-beta.8) — 1 new changeset.

Patch Changes

• Standalone Mermaid files (.mmd / .mermaid) are now editable, matching the WYSIWYG editing you already get for ```mermaid code fences inside a document. Opening one of these files shows the same rendered diagram — click a flowchart node/edge label, a sequence message, or a participant to edit it in place — and the toolbar's source toggle now opens an editable source view (with Mermaid syntax highlighting) instead of a read-only one. Edits autosave to the file and sync live, since these files are now backed by the same real-time collaboration and undo as every other document.