Pass Studio history, dictation, and attachment adapters directly into useLocalRuntime instead of relying on assistant-ui's unstable_Provider ordering, which fixes blank chat threads on reload and broken image upload / drag-drop on fresh PyPI and curl installs that resolved @assistant-ui/react to the newer _RuntimeBinder path.
Also pins @assistant-ui/react, @assistant-ui/react-markdown, @assistant-ui/react-streamdown, and assistant-stream to exact versions in package.json so future installs cannot silently re-float onto a newer pre-1.0 release. The lockfile alone only fixes resolution for the install that consumes it -- a future bun add / npm install <other-pkg> rewrites the lockfile and is free to drift carets within their range, which is exactly the path that pulled @assistant-ui/react from 0.12.19 to 0.12.28 and broke 2026.5.1.
Adds studio/frontend/package-lock.json so npm fallback / fresh installs have deterministic resolution.
Tests:
- bun run typecheck
- npm ci on a clean tree (1083 packages)
- npm run build (bundle no longer contains the unstable_Provider Studio call site; only assistant-ui internals reference unstable_Provider)
