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/utils/keyboard.ts

@@ -0,0 +1,11 @@
+const isMac = window.navigator.platform === "MacIntel";
+
+export const metaDisplay = isMac ? "⌘" : "Ctrl";
+
+export const meta = isMac ? "cmd" : "ctrl";
+
+export function isModKey(
+  event: KeyboardEvent | MouseEvent | React.KeyboardEvent
+) {
+  return isMac ? event.metaKey : event.ctrlKey;
+}