dillon1000/react

Cleanup profile export/import data types, add export/import test

Strengthened the I/O-boundary type conversion logic.

Fixed type inconsistencies uncovered by removing `any` and
by making explicit type annotations and transformations.

In particular, these were likely malformed when restored from a file:
- `commitDetails`
- `interactions`
- `initialTreeBaseDurations`

The mismatches were Map vs interleaved Array.