docs: nodejs failing CI is fixed (#2802)

Fixes the breaking CI for nodejs, related to the documentation of the
new Permutation API in typescript.

- Expanded the generated typings in `nodejs/lancedb/native.d.ts` to
include `SplitCalculatedOptions`, `splitNames` fields, and the
persist/options-based `splitCalculated` methods so the permutation
exports match the native API.
- The previous block comment block had an inconsistency.
`splitCalculated` takes an options object (`SplitCalculatedOptions`) in
our bindings, not a bare string. The previous example showed
`builder.splitCalculated("user_id % 3");`, which doesn’t match the
actual signature and would fail TS typecheck. I updated the comment to
`builder.splitCalculated({ calculation: "user_id % 3" });` so the
example is now correct.
- Updated the `splitCalculated` example in
`nodejs/lancedb/permutation.ts` to use the options object.
- Ran `npm docs` to ensure docs build correctly.

> [!NOTE]
> **Disclaimer**: I used GPT-5.1-Codex-Max to make these updates, but I
have read the code and run `npm run docs` to verify that they work and
are correct to the best of my knowledge.

docs/src/js/README.md

@@ -34,7 +34,7 @@ const results = await table.vectorSearch([0.1, 0.3]).limit(20).toArray();
 console.log(results);
 ```
 
-The [quickstart](https://lancedb.com/docs/quickstart/basic-usage/) contains a more complete example.
+The [quickstart](https://lancedb.com/docs/quickstart/basic-usage/) contains more complete examples.
 
 ## Development
 

docs/src/js/classes/PermutationBuilder.md

@@ -147,7 +147,7 @@ A new PermutationBuilder instance
 #### Example
 
 ```ts
-builder.splitCalculated("user_id % 3");
+builder.splitCalculated({ calculation: "user_id % 3" });
 ```
 
 ***