* fix(mermaid): parse compact multidirectional labels * fix(mermaid): preserve source ids ending in markers * chore: bump plugin version to 2.6.2 * chore: bump plugin version to 2.6.4 * fix: preserve single-character Mermaid source IDs * fix: preserve chained Mermaid marker IDs --------- Co-authored-by: Cathryn Lavery <cathryn@bestself.co>