Allow editing Agent2 messages (#36155)

Release Notes:

- N/A

---------

Co-authored-by: Antonio Scandurra <me@as-cii.com>
Co-authored-by: Agus Zubiaga <agus@zed.dev>

crates/acp_thread/Cargo.toml

@@ -23,6 +23,7 @@ anyhow.workspace = true
 buffer_diff.workspace = true
 collections.workspace = true
 editor.workspace = true
+file_icons.workspace = true
 futures.workspace = true
 gpui.workspace = true
 itertools.workspace = true