Merge pull request #223 from cBioPortal/feature/dataset-catalog-frontend

feat: integrate dataset catalog with auth and credential minting

Author: hweej

.changeset/dataset-catalog-frontend.md

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+---
+"@cbioportal-cell-explorer/zarrstore": minor
+"@cbioportal-cell-explorer/highperformer": minor
+---
+
+Add dataset catalog integration with credential minting for private zarr stores. ZarrStore.open() and AnnDataStore.open() accept optional overrides for auth headers. Home page shows tabbed Catalog/My URLs with status probing. UserAvatar component with popover sign-out. Support ?dataset=slug URL param and config serialization.