Extracts the cross-type "most recently updated active workspace"
selector that previously lived inline in cmd/last and cmd/delete.
The helper takes only a root path and returns (nil, nil) when
nothing matches, which keeps the call sites trivial.
Eight focused tests cover:
- tasks-only fixture
- projects-only fixture
- project most-recent vs older task
- task most-recent vs older project
- legacy v0.2 workspace (no Type field) winning, treated as task
- newest workspace archived, older active project wins
- empty root returns (nil, nil)
- all archived returns (nil, nil)
A new createTestWorkspaceFull helper takes an explicit UpdatedAt
timestamp so the "which is newest" assertions don't depend on
wall-clock ordering.
cmd/last and cmd/delete are migrated onto the helper in the next
commit.
typebasedio
3a4a8d28f2