The implementation is complete. Here's a summary of the changes made: (#1871)

## Summary

I've implemented the GitHub PR status display on `WorkspaceSummary.tsx`. The changes include:

### Backend Changes

1. **`crates/db/src/models/merge.rs`** - Added a new method `get_latest_pr_status_for_workspaces()` that efficiently queries the latest PR status for all workspaces grouped by archived status.

2. **`crates/server/src/routes/task_attempts/workspace_summary.rs`** - Added `pr_status: Option<MergeStatus>` field to the `WorkspaceSummary` struct and included the PR status query in the summary endpoint.

### Frontend Changes

3. **`frontend/src/components/ui-new/hooks/useWorkspaces.ts`** - Added `prStatus` to the `SidebarWorkspace` interface and mapped it in `toSidebarWorkspace()`.

4. **`frontend/src/components/ui-new/primitives/WorkspaceSummary.tsx`** - Added:
   - Import for `GitPullRequestIcon`
   - `prStatus` prop to the component
   - Display logic showing:
     - **PR open**: `GitPullRequestIcon` with `text-brand` (orange) color
     - **PR merged**: `GitPullRequestIcon` with `text-success` (green) color
     - **No PR/closed/unknown**: No icon displayed

5. **`frontend/src/components/ui-new/views/WorkspacesSidebar.tsx`** - Passed the `prStatus` prop to both active and archived workspace summaries.

### Generated Types

6. **`shared/types.ts`** - Auto-generated to include the new `pr_status` field in `WorkspaceSummary`.

shared/types.ts

@@ -352,7 +352,11 @@ has_running_dev_server: boolean,
 /**
  * Does this workspace have unseen coding agent turns?
  */
-has_unseen_turns: boolean, };
+has_unseen_turns: boolean, 
+/**
+ * PR status for this workspace (if any PR exists)
+ */
+pr_status: MergeStatus | null, };
 
 export type WorkspaceSummaryResponse = { summaries: Array<WorkspaceSummary>, };