Multi-project stage 1 against the shared hub (platform design
docs/architecture/projects.md, § Studio):
- ChainWorkspaceSwitcher in the Audit + Approvals AppBars: lists the
registry (colour dot per project, shield for protected, honesty
tooltip), 'All projects' stays reachable — a filter, not a jail.
Selection is persisted and shared via the Workspace notifier.
- Audit page: list query AND live stream re-scoped hub-side on switch.
- Approvals page: pending + history scoped; the sidebar badge counts
the active workspace's pending approvals.
- Flow runs are stamped with the active workspace; a flow file
carrying its own project: keeps it (file wins, CLI semantics).
- Data layer: listProjects/ProjectRef; project fields on AuditEvent,
PendingApproval(+Record), SavedFlow; project params through
HubService. l10n DE+EN. Widget tests for the switcher contract.
Visual verification (light+dark screenshots) still pending — the
shared desktop was in active use; code paths are covered by
flutter test (26 green).
Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>
