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/components/graphql/graphqlAtoms.ts

@@ -1,4 +1,4 @@
-import { atomWithKVStorage } from '../../lib/atoms/atomWithKVStorage';
+import { atomWithKVStorage } from "../../lib/atoms/atomWithKVStorage";
 
 export const showGraphQLDocExplorerAtom = atomWithKVStorage<
   Record<
@@ -11,4 +11,4 @@ export const showGraphQLDocExplorerAtom = atomWithKVStorage<
     | null
     | undefined
   >
->('show_graphql_docs', {});
+>("show_graphql_docs", {});