convert Repliear to use the row versioning strategy

[tantaman]

Based on todo-row-versioning. This won't diff well since it re-structured the app and switched to Vite.

Most relevant files:

Meta

• readme.md - how to run locally

Server

• schema.ts - DB Schema
• pull.ts - Pull implementation.
• cvr.ts - Functions diff against and populate a CVR

Note that past CVRs contribute to the current CVR. I.e., all data the client currently has is represented by all data we've ever sent. If any CVR is dropped we'll just re-fetch the rows that the CVR used to have.

Client

• app.tsx#sync - pull chunks of issues/comments/descriptions until we're done
• mutators.ts - mutators using Rails
• issue-detail.ts - loading data via Rails

Note that I'm currently only allowing one tab to pull at once. This is explained in pull.ts in the comment above dropCVREntries. This is something I could fix if we want to keep the behavior of allowing tabs to sync the same data at the same time.