Fix directory context paths (#28459)

Release Notes:

- N/A

crates/agent/src/context_strip.rs

@@ -1,3 +1,4 @@
+use std::path::Path;
 use std::rc::Rc;
 
 use collections::HashSet;
@@ -9,6 +10,7 @@ use gpui::{
 };
 use itertools::Itertools;
 use language::Buffer;
+use project::ProjectItem;
 use ui::{KeyBinding, PopoverMenu, PopoverMenuHandle, Tooltip, prelude::*};
 use workspace::{Workspace, notifications::NotifyResultExt};
 
@@ -93,26 +95,23 @@ impl ContextStrip {
         let active_buffer_entity = editor.buffer().read(cx).as_singleton()?;
         let active_buffer = active_buffer_entity.read(cx);
 
-        let path = active_buffer.file()?.full_path(cx);
+        let project_path = active_buffer.project_path(cx)?;
 
         if self
             .context_store
             .read(cx)
-            .will_include_buffer(active_buffer.remote_id(), &path)
+            .will_include_buffer(active_buffer.remote_id(), &project_path)
             .is_some()
         {
             return None;
         }
 
-        let name = match path.file_name() {
-            Some(name) => name.to_string_lossy().into_owned().into(),
-            None => path.to_string_lossy().into_owned().into(),
-        };
+        let file_name = active_buffer.file()?.file_name(cx);
 
-        let icon_path = FileIcons::get_icon(&path, cx);
+        let icon_path = FileIcons::get_icon(&Path::new(&file_name), cx);
 
         Some(SuggestedContext::File {
-            name,
+            name: file_name.to_string_lossy().into_owned().into(),
             buffer: active_buffer_entity.downgrade(),
             icon_path,
         })