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/editor.rs

@@ -871,7 +871,6 @@ pub struct Editor {
     show_breadcrumbs: bool,
     show_gutter: bool,
     show_scrollbars: bool,
-    disable_scrolling: bool,
     disable_expand_excerpt_buttons: bool,
     show_line_numbers: Option<bool>,
     use_relative_line_numbers: Option<bool>,
@@ -1668,7 +1667,6 @@ impl Editor {
             blink_manager: blink_manager.clone(),
             show_local_selections: true,
             show_scrollbars: true,
-            disable_scrolling: false,
             mode,
             show_breadcrumbs: EditorSettings::get_global(cx).toolbar.breadcrumbs,
             show_gutter: mode.is_full(),
@@ -16487,11 +16485,6 @@ impl Editor {
         cx.notify();
     }
 
-    pub fn disable_scrolling(&mut self, cx: &mut Context<Self>) {
-        self.disable_scrolling = true;
-        cx.notify();
-    }
-
     pub fn set_show_line_numbers(&mut self, show_line_numbers: bool, cx: &mut Context<Self>) {
         self.show_line_numbers = Some(show_line_numbers);
         cx.notify();