fix(types): export the generated Data union instead of a deleted module

`lib/index.d.ts` re-exported `Data` from `src/types/core/data`, which was
removed in 1f1898e ("refactor: Generate data type union instead of hand
writing"). That commit repointed the five importers under `src/types/`, but
`lib/index.d.ts` and `src/types/core/data.internal.d.ts` were missed.

The entry point already re-exports the generated schema with `export type *`,
and the generator now emits `Data` there. An explicit named re-export takes
precedence over a star re-export, so the dangling line shadowed the working
union and `Data` resolved to `any` for every consumer. `skipLibCheck: true` —
the default in most app tsconfigs — hides the unresolved module, so the failure
is silent: traces annotated `Data` are simply unchecked.

Reproduced against plotly.js 4.0.0 from npm:

    import type { Data } from 'plotly.js';
    declare const d: Data;
    const n: number = d;              // no error
    const s = d.nonexistentProperty;  // no error

Both now error as expected, and `FullData` resolves with `skipLibCheck: false`.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: jcampbell

lib/index.d.ts

@@ -61,12 +61,6 @@ export type {
     YAxisName
 } from '../src/types/core/layout';
 
-// ---------------------------------------------------------------------------
-// Trace data
-// ---------------------------------------------------------------------------
-
-export type { Data } from '../src/types/core/data';
-
 // ---------------------------------------------------------------------------
 // Configuration
 // ---------------------------------------------------------------------------

src/types/core/data.internal.d.ts

@@ -2,11 +2,11 @@
  * Internal data/trace types (not in public API)
  *
  * These are runtime-resolved versions of trace data with internal state
- * properties. For public trace types, see data.d.ts.
+ * properties. For public trace types, see generated/schema.d.ts.
  */
 
 import type { Datum } from '../lib/common';
-import type { Data } from './data';
+import type { Data } from '../generated/schema';
 
 /**
  * Calculated trace data (internal).