fix: add TimeRange to date/index.ts re-export

The shared/index.ts re-exports TimeRange from ./date, but TimeRange was
missing from the date barrel (shared/date/index.ts). This caused a
resolution failure. TimeRange is defined in shared/date/types.ts
alongside DateRange and other date types, so it belongs in the same
barrel export.

Verified: build passes and TimeRange appears in dist/shared.d.ts.

Bahtya

Author: Bahtya

packages/core/src/shared/date/index.ts

@@ -35,6 +35,7 @@ export type {
   SegmentContentObj,
   SegmentPart,
   SegmentValueObj,
+  TimeRange,
   TimeSegmentObj,
   TimeSegmentPart,
 } from './types'