fix: preserve cross-platform swc bindings in lockfile after rxjs override

Previous commit (43ad74f) regenerated package-lock.json on macOS,
which silently dropped optional platform-specific @next/swc-* bindings
for non-darwin platforms. CI on Linux failed with 'Failed to load
native binding' on apps/cockpit/next.config.ts and apps/website/.

Restore main's lockfile then surgically remove only the nested
@ag-ui/client/node_modules/rxjs entry (the override target). Verified:
all 24 @next/swc-* entries present, single hoisted rxjs, npm ci passes
on clean checkout.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: blove