Display what the tool is doing (#27120)

<img width="639" alt="Screenshot 2025-03-19 at 4 56 47 PM"
src="https://github.com/user-attachments/assets/b997f04d-4aff-4070-87b1-ffdb61019bd1"
/>

Release Notes:

- N/A

---------

Co-authored-by: Agus Zubiaga <hi@aguz.me>

crates/assistant_tools/src/path_search_tool.rs

@@ -48,6 +48,13 @@ impl Tool for PathSearchTool {
         serde_json::to_value(&schema).unwrap()
     }
 
+    fn ui_text(&self, input: &serde_json::Value) -> String {
+        match serde_json::from_value::<PathSearchToolInput>(input.clone()) {
+            Ok(input) => format!("Find paths matching “`{}`”", input.glob),
+            Err(_) => "Search paths".to_string(),
+        }
+    }
+
     fn run(
         self: Arc<Self>,
         input: serde_json::Value,
@@ -62,7 +69,7 @@ impl Tool for PathSearchTool {
         };
         let path_matcher = match PathMatcher::new(&[glob.clone()]) {
             Ok(matcher) => matcher,
-            Err(err) => return Task::ready(Err(anyhow!("Invalid glob: {}", err))),
+            Err(err) => return Task::ready(Err(anyhow!("Invalid glob: {err}"))),
         };
         let snapshots: Vec<Snapshot> = project
             .read(cx)