zeta: Rework displaying paths in completion rating modal (#23129)

Two issues i ran into while looking at the completion rating modal
- Single-file worktrees file names are not displayed at all
- Hard to see the filename when the path is long (lots of directories)

This PR fixes this by displaying the filename on the left, followed by
the full path (including the worktree name), similar to how we do it in
the file finder/assistant panel /file command
| Before | After |
|--------|--------|
| <img width="1067" alt="Screenshot 2025-01-14 at 16 09 05"
src="https://github.com/user-attachments/assets/628fde18-da9a-4d98-8ddf-ed0ab0cd8d35"
/> | <img width="1161" alt="Screenshot 2025-01-14 at 16 17 52"
src="https://github.com/user-attachments/assets/80c6a4e1-065d-4b0a-b9c0-5f3391af4557"
/> |





Release Notes:

- N/A

crates/zeta/src/rate_completion_modal.rs

@@ -495,6 +495,9 @@ impl Render for RateCompletionModal {
                                                 (false, false) => (IconName::FileDiff, Color::Accent, "Edits Available"),
                                             };
 
+                                            let file_name = completion.path.file_name().map(|f| f.to_string_lossy().to_string()).unwrap_or("untitled".to_string());
+                                            let file_path = completion.path.parent().map(|p| p.to_string_lossy().to_string());
+
                                             ListItem::new(completion.id)
                                                 .inset(true)
                                                 .spacing(ListItemSpacing::Sparse)
@@ -511,7 +514,11 @@ impl Render for RateCompletionModal {
                                                         )
                                                         .child(
                                                             v_flex()
-                                                                .child(Label::new(completion.path.to_string_lossy().to_string()).size(LabelSize::Small))
+                                                                .child(
+                                                                    h_flex().gap_2()
+                                                                        .child(Label::new(file_name).size(LabelSize::Small))
+                                                                        .when_some(file_path, |this, p| this.child(Label::new(p).size(LabelSize::Small).color(Color::Muted)))
+                                                                )
                                                                 .child(Label::new(format!("{} ago, {:.2?}", format_time_ago(completion.response_received_at.elapsed()), completion.latency()))
                                                                     .color(Color::Muted)
                                                                     .size(LabelSize::XSmall)

crates/zeta/src/zeta.rs

@@ -293,7 +293,7 @@ impl Zeta {
         let events = self.events.clone();
         let path = snapshot
             .file()
-            .map(|f| f.path().clone())
+            .map(|f| Arc::from(f.full_path(cx).as_path()))
             .unwrap_or_else(|| Arc::from(Path::new("untitled")));
 
         let client = self.client.clone();