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/FullscreenLoading.tsx

@@ -0,0 +1,23 @@
+import * as React from "react";
+import styled from "styled-components";
+import Empty from "~/components/Empty";
+import Fade from "~/components/Fade";
+import Flex from "~/components/Flex";
+
+export default function FullscreenLoading() {
+  return (
+    <Fade timing={500}>
+      <Centered>
+        <Empty>Loading…</Empty>
+      </Centered>
+    </Fade>
+  );
+}
+
+const Centered = styled(Flex)`
+  text-align: center;
+  width: 100%;
+  height: 100%;
+  align-items: center;
+  justify-content: center;
+`;