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/PageTheme.ts

@@ -0,0 +1,31 @@
+import * as React from "react";
+import { useTheme } from "styled-components";
+import useStores from "~/hooks/useStores";
+
+export default function PageTheme() {
+  const { ui } = useStores();
+  const theme = useTheme();
+
+  React.useEffect(() => {
+    // wider page background beyond the React root
+    if (document.body) {
+      document.body.style.background = theme.background;
+    }
+
+    // theme-color adjusts the title bar color for desktop PWA
+    const themeElement = document.querySelector('meta[name="theme-color"]');
+
+    if (themeElement) {
+      themeElement.setAttribute("content", theme.background);
+    }
+
+    // user-agent controls and scrollbars
+    const csElement = document.querySelector('meta[name="color-scheme"]');
+
+    if (csElement) {
+      csElement.setAttribute("content", ui.resolvedTheme);
+    }
+  }, [theme, ui.resolvedTheme]);
+
+  return null;
+}