* feat(dashboard): surface thread sandbox ID in sidebar
Port of upstream #1689 (feb7ac98): expose the thread's sandbox_id on the
dashboard thread summary and surface it in the sidebar via a "Copy sandbox
ID" action.
- thread_api: add sandboxId to the thread summary, hiding the
"__creating__" in-flight sentinel.
- queries/types: thread the sandboxId field through AgentThread and the
optimistic thread.
- AgentsSidebar: replace the hover-only resolve/delete buttons and the
right-click context menu with one touch-friendly kebab (⋮) menu that
works on both pointer and touch, and add the Copy sandbox ID item.
- vite: disable the PWA service worker in dev (it precaches assets and
defeats HMR).
- tests: unit test for the summary field + e2e spec in the real-backend
harness.
Closes#140. Part of #134.
* chore(triage): mark feb7ac98 (#1689) landed
Ported to dev via feat/thread-sandbox-id-sidebar (#140).
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