Studio's three MVP pages now pull live data from a running hub
via fai_dart_sdk. Mock fixture removed.
- data/hub.dart: HubService singleton wraps fai_dart_sdk's
HubClient and exposes UI-friendly types (ModuleSummary,
AuditEvent, PendingApproval) so pages don't import protobuf.
- pages/modules.dart: FutureBuilder against listModules,
groups CapabilityEntry rows by module, retry-on-error UI.
- pages/audit.dart: 2s polling Timer, status bar shows
"live (polling 2s)" or "disconnected — <error>".
- pages/approvals.dart: live listApprovals, Approve sends
DecideApproval(APPROVE), Reject opens a reason dialog and
sends DecideApproval(REJECT). Both refresh after success.
- Connection-error states across all pages: cloud_off icon +
hint to start `fai serve` + Retry button.
When no hub is running the pages render their disconnected
state instead of crashing. When a hub is running, the data is
real — no more mock fixture.
Bumps fai_studio 0.1.0 -> 0.2.0.
Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>
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