ThePalaceProject / web-patron / 18918018923

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Improve type checking and accept linting changes (PP-3166) (#73)

## Description

- Removes type checking exemptions in almost all cases.
- In the couple cases that remain, they have been narrowed
substantially.
- Fixes a bunch of types and associated type errors.
- Re-enables `prettier` linting and accepts associated `eslint` fixes.
- Reduces some unneeded complexity.

## Motivation and Context

We were doing a lot of project- and module-level suppressing of type and
linting errors. This meant that it was easy to introduce new errors into
the code.

[Jira PP-3166]

## How Has This Been Tested?

- Manually testing locally.
- Lint checks and tests pass, no tsc error output, and builds succeed
locally.
- [CI
checks](https://github.com/ThePalaceProject/web-patron/actions/runs/18895160040)
pass.

## Checklist:

- [x] I have updated the documentation accordingly.
- [x] All new and existing tests passed.

832 of 1086 branches covered (76.61%)

Branch coverage included in aggregate %.

34 of 40 new or added lines in 11 files covered. (85.0%)

1434 of 1621 relevant lines covered (88.46%)

28.77 hits per line