Do not show directories in the InvalidBufferView (#36906)

Follow-up of https://github.com/zed-industries/zed/pull/36764

Release Notes:

- N/A

crates/workspace/src/invalid_buffer_view.rs

@@ -1,4 +1,4 @@
-use std::{path::PathBuf, sync::Arc};
+use std::{path::Path, sync::Arc};
 
 use gpui::{EventEmitter, FocusHandle, Focusable};
 use ui::{
@@ -12,7 +12,7 @@ use crate::Item;
 /// A view to display when a certain buffer fails to open.
 pub struct InvalidBufferView {
     /// Which path was attempted to open.
-    pub abs_path: Arc<PathBuf>,
+    pub abs_path: Arc<Path>,
     /// An error message, happened when opening the buffer.
     pub error: SharedString,
     is_local: bool,
@@ -21,7 +21,7 @@ pub struct InvalidBufferView {
 
 impl InvalidBufferView {
     pub fn new(
-        abs_path: PathBuf,
+        abs_path: &Path,
         is_local: bool,
         e: &anyhow::Error,
         _: &mut Window,
@@ -29,7 +29,7 @@ impl InvalidBufferView {
     ) -> Self {
         Self {
             is_local,
-            abs_path: Arc::new(abs_path),
+            abs_path: Arc::from(abs_path),
             error: format!("{e}").into(),
             focus_handle: cx.focus_handle(),
         }
@@ -43,7 +43,7 @@ impl Item for InvalidBufferView {
         // Ensure we always render at least the filename.
         detail += 1;
 
-        let path = self.abs_path.as_path();
+        let path = self.abs_path.as_ref();
 
         let mut prefix = path;
         while detail > 0 {