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/useRandomKey.ts

@@ -1,5 +1,5 @@
-import { useCallback, useState } from 'react';
-import { generateId } from '../lib/generateId';
+import { useCallback, useState } from "react";
+import { generateId } from "../lib/generateId";
 
 export function useRandomKey(initialValue?: string) {
   const [value, setValue] = useState<string>(initialValue ?? generateId());