persistence: More error contexts (#40787)

Release Notes:

- N/A *or* Added/Fixed/Improved ...

Co-authored-by: David Kleingeld <davidsk@zed.dev>

crates/workspace/src/persistence/model.rs

@@ -3,7 +3,7 @@ use crate::{
     Member, Pane, PaneAxis, SerializableItemRegistry, Workspace, WorkspaceId, item::ItemHandle,
     path_list::PathList,
 };
-use anyhow::Result;
+use anyhow::{Context, Result};
 use async_recursion::async_recursion;
 use collections::IndexSet;
 use db::sqlez::{
@@ -220,6 +220,7 @@ impl SerializedPaneGroup {
                 let new_items = serialized_pane
                     .deserialize_to(project, &pane, workspace_id, workspace.clone(), cx)
                     .await
+                    .context("Could not deserialize pane)")
                     .log_err()?;
 
                 if pane