Redesign Disks section to group datasets under a shared pool header

Denis Morozovrequested to merge
feature/improve-datasets-info-ui into master

Closes #682 (closed)

Summary

  • Replaces the misleading display where each dataset card showed identical pool-level storage numbers (size, used, free, progress bar) with a grouped layout
  • One pool header shows the true shared ZFS storage stats (total size, progress bar, used size + percentage, free percentage)
  • Below the header, each dataset gets its own card showing dataset-specific info: mode, clones, snapshots, size
  • When a pool has no child datasets (e.g. dblab_pool_01), the redundant dataset name is suppressed — the pool header already identifies it
Edited by Denis Morozov

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