chore: Move to Typescript (#2783)

This PR moves the entire project to Typescript. Due to the ~1000 ignores this will lead to a messy codebase for a while, but the churn is worth it – all of those ignore comments are places that were never type-safe previously.

closes #1282

app/components/EventBoundary.tsx

@@ -0,0 +1,19 @@
+import * as React from "react";
+
+type Props = {
+  children: React.ReactNode;
+  className?: string;
+};
+
+export default function EventBoundary({ children, className }: Props) {
+  const handleClick = React.useCallback((event: React.SyntheticEvent) => {
+    event.preventDefault();
+    event.stopPropagation();
+  }, []);
+
+  return (
+    <span onClick={handleClick} className={className}>
+      {children}
+    </span>
+  );
+}