Run oxfmt across repo, add format script and ignore config

Format all non-generated files with oxfmt via `vp fmt`. Add
.oxfmtignore to skip bindings/ and wasm-pack output. Add npm
format script and update DEVELOPMENT.md docs.

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

src-web/hooks/useContainerQuery.ts

@@ -1,5 +1,5 @@
-import type { RefObject } from 'react';
-import { useLayoutEffect, useState } from 'react';
+import type { RefObject } from "react";
+import { useLayoutEffect, useState } from "react";
 
 export function useContainerSize(ref: RefObject<HTMLElement | null>) {
   const [size, setSize] = useState<{ width: number; height: number }>({ width: 0, height: 0 });