Replaces group-drilling navigation with a flat, filterable/searchable
entry list backed by VaultViewModel.displayedEntries. SearchView's
role is fully absorbed by EntryListView's .searchable() modifier.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WYqycDFsynHH9VnnK7LNSf
