**Category:** fix
**User Impact:** Typing immediately after sending to a persistently
addressed agent now continues after the agent mention instead of
corrupting it.
**Problem:** Post-send restoration passed the persistent `@Agent `
prefix through the Markdown parser, which discarded its trailing
separator and left WebKit rendering the caret at the mention boundary.
**Solution:** Restore the prefix as literal ProseMirror text, preserve
the separator, and focus a selection placed at the restored document
end. This does not expand or otherwise change the setting’s existing
scope: persistent addressed agents remain thread-only.
<details>
<summary>File changes</summary>
**desktop/src/features/messages/lib/useRichTextEditor.ts**
Adds a focused plain-text restoration helper that preserves trailing
whitespace while suppressing authored-update reconciliation.
**desktop/src/features/messages/ui/useMentionSendFlow.ts**
Routes non-empty post-send persistent audience restoration through the
literal-text helper instead of Markdown content loading.
**desktop/tests/e2e/persistent-agent-audience.spec.ts**
Extends the real Enter-send flow to assert the preserved separator,
document-end selection, and immediate typing outside the agent mention.
</details>
## Reproduction steps
1. Open a thread with a persistently addressed agent.
2. Send a message with Enter.
3. Confirm the composer restores the addressed agent and a trailing
space.
4. Type immediately without clicking the composer.
5. Confirm the new text appears after the agent mention and the mention
remains highlighted.
https://github.com/user-attachments/assets/92f088aa-a516-48d1-acde-35e29f558f14
---------
Signed-off-by: Taylor Ho <taylorkmho@gmail.com>
