agent: Improve edit file tool card (#29448)

⚠️ Work in progress until all of the to-dos are knocked out:

- [x] Disable soft-wrapping
- [x] Make it foldable only after a certain number of lines
- [x] Display tool status errors
- [x] Fix horizontal scroll now that we've disabled soft-wrap
- [ ] Don't render unnecessary extra lines (will be added later, on a
follow-up PR)

Release Notes:

- N/A

---------

Co-authored-by: Agus Zubiaga <hi@aguz.me>
Co-authored-by: Michael Sloan <mgsloan@gmail.com>

crates/editor/src/element.rs

@@ -5678,9 +5678,7 @@ impl EditorElement {
     }
 
     fn paint_mouse_listeners(&mut self, layout: &EditorLayout, window: &mut Window, cx: &mut App) {
-        if !self.editor.read(cx).disable_scrolling {
-            self.paint_scroll_wheel_listener(layout, window, cx);
-        }
+        self.paint_scroll_wheel_listener(layout, window, cx);
 
         window.on_mouse_event({
             let position_map = layout.position_map.clone();