Usage notes (harness behavior, accepted as-is)

Where @ triggers: the trigger char must sit at the start of the draft, after whitespace, or after punctuation. A Chinese character directly before @ does not trigger (请查看@index is a miss; 请查看，@index works) — the trigger detector treats CJK letters as word characters. That rule lives in the harness's ui-input-trigger; this plugin does not modify the harness, so inline references work best with a space or punctuation before @.
Loading state: while the project tree loads, the menu opens immediately with the group's existing text-only loading row (正在加载…); an animated spinner would require modifying the harness menu component, which this plugin does not do.
No chip decoration: @path stays plain text in the draft — the decoration scanner only matches word-ish names, so paths never render as chips (DESIGN.md §7.1).
No menu group title: the harness menu renders a raw per-source title row (the slash.menu dictionary is exclusively owned by the harness); since @ shows only this plugin's group, the title row is hidden with one injected CSS rule.
Full boundary list: DESIGN.md §7.

@dsh-mixxed/dsh-client-ui-filesystem