* [editor-core] address zod violation for group_id
* [monorepo] use discriminated union in zod schemas where possible
* [editor-core] v1_source_doc_id is a number
GitOrigin-RevId: 38f591b07cca4e22954bfe30bf855545a6af675d
* [editor-core] extend coverage of zod schemas
* [real-time] adopt strict zod types and extend test coverage
* [project-history] make type check happy
* [web] make type check happy
GitOrigin-RevId: e1a65b9b3560b31ad2af817067a4b549865a5bb1