Convert to TypeScript

[wilkie]

Uses the strict TypeScript config in /frontend/packages/lint-config to get this repo locked to the same TypeScript and TS linting situation as the main repo.

This also converts function MyComponent({}) { } into const MyComponent = ({}: MyComponentProps) => { }

Snuck an upgrade to fontawesome which just updated the package.json/yarn.lock.

2026-04-09.14-54-52.mp4

[stephenliang]

Very minor nits, all of which are probably considered stylistic or out of scope for this PR (error handling scenarios). However I do think we can possibly avoid a type cast in the dispatcher.

[stephenliang]

Note: I think you need to also add a typecheck script. If I run typecheck manually, it seems to error.

npx tsc

throws quite a number of type errors.

[wilkie]

I have rebased, added a yarn typecheck command, added the necessary type declarations, and addressed many of the weird situations from the old codebase where functions return null only to be assumed not-null by consumers later that the TypeScript port revealed (and the AI just... allowed for some reason.) I'm testing it and will push it up and then probably merge it and move toward the localization fixes we need for CSD and also introducing this to the main repo.

[wilkie]

Added prettier config to match the main repo and just had it 'fix' everything. Now it should conform 99% to what the frontend packages directory wants.

[wilkie]

I confirmed that all of the modes work, the metrics fire, and the animations seem to be correct. No major issues, certainly.