agent: Make read_file and edit_file tool call titles more specific (#37639)

For read_file and edit_file, show the worktree-relative path if there's
only one visible worktree, and the "full path" otherwise. Also restores
the display of line numbers for read_file calls.

Release Notes:

- N/A

crates/agent2/src/tools/open_tool.rs

@@ -45,7 +45,11 @@ impl AgentTool for OpenTool {
         ToolKind::Execute
     }
 
-    fn initial_title(&self, input: Result<Self::Input, serde_json::Value>) -> SharedString {
+    fn initial_title(
+        &self,
+        input: Result<Self::Input, serde_json::Value>,
+        _cx: &mut App,
+    ) -> SharedString {
         if let Ok(input) = input {
             format!("Open `{}`", MarkdownEscaped(&input.path_or_url)).into()
         } else {
@@ -61,7 +65,7 @@ impl AgentTool for OpenTool {
     ) -> Task<Result<Self::Output>> {
         // If path_or_url turns out to be a path in the project, make it absolute.
         let abs_path = to_absolute_path(&input.path_or_url, self.project.clone(), cx);
-        let authorize = event_stream.authorize(self.initial_title(Ok(input.clone())), cx);
+        let authorize = event_stream.authorize(self.initial_title(Ok(input.clone()), cx), cx);
         cx.background_spawn(async move {
             authorize.await?;