Refactor frontend to use camelCase for all data responses

**Describe the task**
Currently all our apps use snake_case for variable names on the frontend, because that's what they receive from the Python backend. But for the purpose of consistency, our Typescript frontend should be using camelCase.

Suggest a refactor on the frontend so that all data received from the backend gets automatically re-formatted to use camelCase naming conventions.

There's an npm package that could help us with this - https://www.npmjs.com/package/camelcase

**Acceptance Criteria**
- [ ] Python backend still uses snake_case, Typescript frontend uses camelCase
- [ ] regression test

**Additional context**
- Consider something like protobuff to achieve this.

The issue names no files, entry points, or existing tests. Start by tracing how Python backend responses enter the TypeScript frontend and assess the suggested camelcase package or protobuf approach. Done means backend responses remain snake_case, frontend data is consistently camelCase, and a regression test passes.

Written by the indexing model from the issue text.