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/useDebouncedValue.ts

@@ -1,5 +1,5 @@
-import { useEffect } from 'react';
-import { useDebouncedState } from './useDebouncedState';
+import { useEffect } from "react";
+import { useDebouncedState } from "./useDebouncedState";
 
 export function useDebouncedValue<T>(value: T, delay = 500) {
   const [state, setState] = useDebouncedState<T>(value, delay);