IsoPipeline now publishes refs to its currently-live NdiReceiver and NdiSender (set by RunInnerPipelineAsync, cleared on exit) so a stats poll from any thread can read FramesCaptured / FramesSent without entangling the pipeline's lifetime with its observer. The receiver's raw-frame channel is wrapped with a TappedChannelWriter so the most recent RawFrame is captured for source-resolution display, again without changing the receiver's contract.
IsoController.GetStats() drops the stub return-Empty and instead reads the live pipeline.GetStats() outside the gate so a slow stats read can't serialize the controller's other operations.
WPF: MainViewModel runs a 1 Hz DispatcherTimer that pulls stats for every participant view-model and pushes them via UpdateStats(). ParticipantViewModel grows three displayable properties — FramesIn, FramesOut, IncomingResolution — bound into the participants DataGrid as a new 'Live' column showing the down/up frame counts and the source resolution underneath the machine name.
Tests: 74/74 unit + 9/9 NDI integration green; the existing round-trip integration test exercises the new wiring at runtime (live receiver/sender refs are set, frames flow, channels close cleanly).
Adopts the design language from Dammyjay93/interface-design: warm Stone neutrals, accent orange (#EA580C), borders-only depth (no shadows), 8px spacing grid, all-caps section labels, mono typography for machine names and timecodes.
Themes/StoneTheme.xaml is the single source of truth for design tokens (color brushes, typography styles, spacing) plus restyled control templates (Button, TextBox, ComboBox, ComboBoxItem, CheckBox, DataGrid + DataGridColumnHeader / DataGridRow / DataGridCell, ScrollBar). MainWindow consumes the tokens and is laid out with a header (title + status pill), section-headed Settings sidebar (Output Format / NDI Network / Display), card-wrapped participant list, and a mono status footer.
Settings sidebar surfaces the new NDI group configuration (discovery + output) and a Hide-(Local) checkbox. The latter filters the user's own self-preview from the participants list at the MainViewModel layer (HideLocalSelf=true by default) so operators don't accidentally route their own preview as an ISO. Apply Changes round-trips both FrameProcessingSettings and NdiGroupSettings through the controller in one go.
