acp: Hide history unless in native agent (#36644)

Release Notes:

- N/A

crates/agent2/src/history_store.rs

@@ -10,6 +10,7 @@ use itertools::Itertools;
 use paths::contexts_dir;
 use serde::{Deserialize, Serialize};
 use std::{collections::VecDeque, path::Path, sync::Arc, time::Duration};
+use ui::ElementId;
 use util::ResultExt as _;
 
 const MAX_RECENTLY_OPENED_ENTRIES: usize = 6;
@@ -68,6 +69,15 @@ pub enum HistoryEntryId {
     TextThread(Arc<Path>),
 }
 
+impl Into<ElementId> for HistoryEntryId {
+    fn into(self) -> ElementId {
+        match self {
+            HistoryEntryId::AcpThread(session_id) => ElementId::Name(session_id.0.into()),
+            HistoryEntryId::TextThread(path) => ElementId::Path(path),
+        }
+    }
+}
+
 #[derive(Serialize, Deserialize, Debug)]
 enum SerializedRecentOpen {
     AcpThread(String),