A sent message accented a `/skill` named mid-prose and nothing else, so an
`@file:` ref and an `[[ Image 1 ]]` token flattened into body text. The
composer painted none of it.
splitComposerHighlights covers the whole vocabulary the desktop chips —
`/work` invoked or referenced, every `@ref` shape including quoted values,
and attachment/paste tokens — and both surfaces read it, so what you type
is what you see once it lands. Supersedes splitSlashSkillRefs.
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