adds icechunk catalog

[lazarusA]

Several improvements to the datasets modal. Also, the icechunk catalog is now available. More options for testing.

[gemini-code-assist]

Code Review

This pull request refactors the dataset selection modal by replacing the curated datasets tab with a reusable StoreCatalog component. This new component is integrated into both the Remote Zarr and Icechunk tabs, allowing users to search and select pre-configured stores from catalogs, which then pre-fill the respective URL inputs. Feedback on these changes highlights a potential bug in the infinite scroll useEffect dependency array within StoreCatalog, suggests making the onOpenDescription prop optional, recommends using Tailwind CSS gradient utilities instead of raw CSS variables to prevent rendering issues, and flags an unused useEffect import in RemoteZarr.

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