Added eslint-plugin-react-compiler, updated packages, fixed warnings/errors

[neoncube2]

eslint-plugin-react-compiler

Added eslint-plugin-react-compiler, to provide additional linting warnings related to React.

.eslintignore deprecation warning
Fixed the following warning, by merging the contents of .eslintignore into eslint.config.js:

(node:20184) ESLintIgnoreWarning: The ".eslintignore" file is no longer supported. Switch to using the "ignores" property in "eslint.config.js": https://eslint.org/docs/latest/use/configure/migration-guide#ignoring-files

Typescript compile error
Fixed some new Typescript compile errors that were caused by updating packages.

It looks like JSX now needs to be referenced as React.JSX

useRef() now requires an initial value, otherwise we get an error like this:

src/useElementRef.ts:5:15 - error TS2554: Expected 1 arguments, but got 0.

5   const ref = useRef<HTMLDivElement>();
                ~~~~~~

  node_modules/.pnpm/@[email protected]/node_modules/@types/react/index.d.ts:1728:24
    1728     function useRef<T>(initialValue: T): RefObject<T>;
                                ~~~~~~~~~~~~~~~
    An argument for 'initialValue' was not provided.

[neoncube2]

Whoops, it looks like some of this PR is a duplicate of #210 XD

If you'd like to merge that one first and have me rebase, just let me know. Or I think you could merge this PR and close that one, either way.