feat: add assistant conversation widget

apps/docs/docs/management/assistant.mdx

@@ -24,6 +24,10 @@ conversation has a minimize action that returns it to the activity bar without i
 `Shift + A` opens the compact conversation panel directly. The shortcut is ignored while typing in text
 fields, selectors, and editable content.
 
+The **Assistant** board widget embeds the same persisted conversation and full interaction surface directly
+on a dashboard. By default it follows the current conversation. Widget settings can instead pin a specific
+conversation; the conversation picker stays hidden until **Pinned conversation** is selected.
+
 When the assistant is unavailable, its command-menu result remains visible but disabled and explains that
 an administrator must configure and enable it.