agent: Show actual file name and icon in context pill (#31813)

Previously in the agent context pill if we added images it showed
generic Image tag on the image context pill. This PR make sure if we
have a path available for a image context show the filename which is in
line with other context pills.


Before | After
--- | ---
![Screenshot 2025-05-31 at 3 14 07
PM](https://github.com/user-attachments/assets/b342f046-2c1c-4c18-bb26-2926933d5d34)
| ![Screenshot 2025-05-31 at 3 14 07
PM](https://github.com/user-attachments/assets/90ad4062-cdc6-4274-b9cd-834b76e8e11b)





Release Notes:

- N/A

---------

Co-authored-by: Bennet Bo Fenner <bennetbo@gmx.de>

crates/agent/src/context_store.rs

@@ -7,7 +7,7 @@ use assistant_context_editor::AssistantContext;
 use collections::{HashSet, IndexSet};
 use futures::{self, FutureExt};
 use gpui::{App, Context, Entity, EventEmitter, Image, SharedString, Task, WeakEntity};
-use language::Buffer;
+use language::{Buffer, File as _};
 use language_model::LanguageModelImage;
 use project::image_store::is_image_file;
 use project::{Project, ProjectItem, ProjectPath, Symbol};
@@ -304,11 +304,13 @@ impl ContextStore {
                 project.open_image(project_path.clone(), cx)
             })?;
             let image_item = open_image_task.await?;
-            let image = image_item.read_with(cx, |image_item, _| image_item.image.clone())?;
+
             this.update(cx, |this, cx| {
+                let item = image_item.read(cx);
                 this.insert_image(
-                    Some(image_item.read(cx).project_path(cx)),
-                    image,
+                    Some(item.project_path(cx)),
+                    Some(item.file.full_path(cx).into()),
+                    item.image.clone(),
                     remove_if_exists,
                     cx,
                 )
@@ -317,12 +319,13 @@ impl ContextStore {
     }
 
     pub fn add_image_instance(&mut self, image: Arc<Image>, cx: &mut Context<ContextStore>) {
-        self.insert_image(None, image, false, cx);
+        self.insert_image(None, None, image, false, cx);
     }
 
     fn insert_image(
         &mut self,
         project_path: Option<ProjectPath>,
+        full_path: Option<Arc<Path>>,
         image: Arc<Image>,
         remove_if_exists: bool,
         cx: &mut Context<ContextStore>,
@@ -330,6 +333,7 @@ impl ContextStore {
         let image_task = LanguageModelImage::from_image(image.clone(), cx).shared();
         let context = AgentContextHandle::Image(ImageContext {
             project_path,
+            full_path,
             original_image: image,
             image_task,
             context_id: self.next_context_id.post_inc(),