fix: use cached snapshot for checkout_pr_status_request

The handler was calling refresh() before every getSnapshot(), forcing
a full git + gh subprocess reload (~1.2s). The filesystem watcher
already keeps the snapshot current, so just read the cache directly.

packages/server/src/server/session.ts

@@ -4718,7 +4718,6 @@ export class Session {
     const { cwd, requestId } = msg;
 
     try {
-      await this.workspaceGitService.refresh(cwd, { priority: "high" });
       const snapshot = await this.workspaceGitService.getSnapshot(cwd);
       this.emit({
         type: "checkout_pr_status_response",