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/useScrollIntoView.ts

@@ -1,9 +1,9 @@
-import { useEffect } from 'react';
+import { useEffect } from "react";
 
 export function useScrollIntoView<T extends HTMLElement>(node: T | null, enabled: boolean) {
   useEffect(() => {
     if (enabled) {
-      node?.scrollIntoView({ block: 'nearest' });
+      node?.scrollIntoView({ block: "nearest" });
     }
   }, [enabled, node]);
 }