Replace the static QListWidget with a full SiloActivityPanel class
that provides:
- Search field with 300ms debounce for filtering items by name
- Type filter dropdown (All / Part / Assembly)
- Refresh button for manual reload
- QTableWidget with Part Number, Description, Type, and Updated columns
- Part Details pane that appears on row selection showing part number,
description, type, revision, last updated date, and project tags
- Open button / double-click to open items via SiloSync.open_item()
- Info button showing revision history dialog (reuses Silo_Info pattern)
- Graceful error handling for connection failures and empty results
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