Run oxfmt across repo, add format script and docs

Add .oxfmtignore to skip generated bindings and wasm-pack output.
Add npm format script, update DEVELOPMENT.md for Vite+ toolchain,
and format all non-generated files with oxfmt.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src-web/hooks/useKeyboardEvent.ts

@@ -1,8 +1,8 @@
-import { useEffect } from 'react';
+import { useEffect } from "react";
 
 export function useKeyboardEvent(
-  event: 'keyup' | 'keydown',
-  key: KeyboardEvent['key'],
+  event: "keyup" | "keydown",
+  key: KeyboardEvent["key"],
   cb: () => void,
 ) {
   // oxlint-disable-next-line react-hooks/exhaustive-deps -- Don't have `cb` as a dep for caller convenience