feat(editor): live step status on the graph during runs

Step run events were previously visible only on the run tab.
Operators who triggered a run there and then switched to
the graph tab saw a static graph — the canvas had no idea
something was executing.

Wire the run events through the FlowEditorController so all
three tabs share the same status snapshot:

 - New StepRunStatus enum on the controller
   (idle / running / done / failed / awaiting).
 - controller.stepStatuses exposes the live map.
 - controller.updateStepStatus is called from the run tab's
   event handler — one source of truth, both views read it.
 - FlowCanvas drops its own stepStatuses parameter and
   pulls from the controller instead, so the canvas now
   shows the running pulse + done check + error cross + pause
   icon in each step's header live, in lockstep with the
   step list on the run tab.

When a fresh run starts (controller.running = true) the
status map is cleared so stale events from a previous run
don't paint the new one.

Signed-off-by: flemming-it <sf@flemming.it>

lib/src/editor_controller.dart

@@ -24,6 +24,12 @@ import 'model/auto_layout.dart';
 import 'model/flow_graph.dart';
 import 'model/layout_store.dart';
 
+/// Mirrors `FlowNodeStatus` from the flow_node widget, but
+/// lives in the controller so the run tab can update it
+/// without importing widgets. The canvas adapts between
+/// the two.
+enum StepRunStatus { idle, running, done, failed, awaiting }
+
 class FlowEditorController extends ChangeNotifier {
   /// Active flow file name (without `.yaml`). `null` while
   /// the editor is empty.
@@ -64,6 +70,14 @@ class FlowEditorController extends ChangeNotifier {
   bool get isRunning => _running;
   bool _running = false;
 
+  /// Live per-step status for the in-flight or most-recent
+  /// run. The canvas pulls colours and icons out of this map
+  /// so the graph view shows real-time progress even when
+  /// the operator triggered the run from the run tab.
+  Map<String, StepRunStatus> get stepStatuses =>
+      Map.unmodifiable(_stepStatuses);
+  final Map<String, StepRunStatus> _stepStatuses = {};
+
   /// Flag flipped during graph -> YAML emission so we don't
   /// loop: the text change listener skips a reparse if it's
   /// already mid-emit.
@@ -121,6 +135,17 @@ class FlowEditorController extends ChangeNotifier {
   set running(bool v) {
     if (_running == v) return;
     _running = v;
+    if (v) {
+      _stepStatuses.clear();
+    }
+    notifyListeners();
+  }
+
+  /// Update the live status of one step. Called by the run
+  /// tab as events arrive from the host's FlowRunDriver.
+  void updateStepStatus(String stepId, StepRunStatus status) {
+    if (_stepStatuses[stepId] == status) return;
+    _stepStatuses[stepId] = status;
     notifyListeners();
   }
 

lib/src/widgets/flow_canvas.dart

@@ -54,12 +54,7 @@ const double _inputsY = 80;
 
 class FlowCanvas extends StatefulWidget {
   final FlowEditorController controller;
-  final Map<String, FlowNodeStatus> stepStatuses;
-  const FlowCanvas({
-    super.key,
-    required this.controller,
-    this.stepStatuses = const {},
-  });
+  const FlowCanvas({super.key, required this.controller});
 
   @override
   State<FlowCanvas> createState() => _FlowCanvasState();
@@ -194,7 +189,8 @@ class _FlowCanvasState extends State<FlowCanvas> {
     final pos = layout.positions[step.id];
     if (pos == null) return const SizedBox.shrink();
     final selected = widget.controller.selectedStepId == step.id;
-    final status = widget.stepStatuses[step.id] ?? FlowNodeStatus.idle;
+    final raw = widget.controller.stepStatuses[step.id] ?? StepRunStatus.idle;
+    final status = _toNodeStatus(raw);
     return Positioned(
       left: pos.x,
       top: pos.y,
@@ -591,6 +587,16 @@ class _DropTarget {
   });
 }
 
+FlowNodeStatus _toNodeStatus(StepRunStatus s) {
+  return switch (s) {
+    StepRunStatus.idle => FlowNodeStatus.idle,
+    StepRunStatus.running => FlowNodeStatus.running,
+    StepRunStatus.done => FlowNodeStatus.done,
+    StepRunStatus.failed => FlowNodeStatus.failed,
+    StepRunStatus.awaiting => FlowNodeStatus.awaiting,
+  };
+}
+
 class _DotGridPainter extends CustomPainter {
   final Color color;
   _DotGridPainter({required this.color});

lib/src/widgets/run_tab.dart

@@ -519,18 +519,31 @@ class _RunTabState extends State<RunTab> {
       switch (event) {
         case StepStarted():
           _liveSteps[event.stepId] = const _StepState(kind: _StepKind.running);
+          widget.controller.updateStepStatus(
+            event.stepId,
+            StepRunStatus.running,
+          );
         case StepCompleted():
           _liveSteps[event.stepId] = _StepState(
             kind: _StepKind.done,
             durationMs: event.durationMs,
           );
+          widget.controller.updateStepStatus(event.stepId, StepRunStatus.done);
         case StepFailed():
           _liveSteps[event.stepId] = _StepState(
             kind: _StepKind.error,
             error: event.error,
           );
+          widget.controller.updateStepStatus(
+            event.stepId,
+            StepRunStatus.failed,
+          );
         case StepAwaitingApproval():
           _liveSteps[event.stepId] = const _StepState(kind: _StepKind.awaiting);
+          widget.controller.updateStepStatus(
+            event.stepId,
+            StepRunStatus.awaiting,
+          );
       }
     });
   }

test/editor_controller_test.dart

@@ -43,9 +43,9 @@ steps:
 outputs: {}
 ''');
       final initialText = c.codeController.fullText;
-      c.applyGraphEdit(c.graph.withStepAdded(
-        const FlowStep(id: 'b', use: 'debug.echo@^0'),
-      ));
+      c.applyGraphEdit(
+        c.graph.withStepAdded(const FlowStep(id: 'b', use: 'debug.echo@^0')),
+      );
       expect(c.codeController.fullText, isNot(initialText));
       expect(c.codeController.fullText, contains('id: b'));
       expect(c.graph.steps, hasLength(2));
@@ -61,9 +61,9 @@ steps:
 outputs: {}
 ''');
       expect(c.isDirty, isFalse);
-      c.applyGraphEdit(c.graph.withStepAdded(
-        const FlowStep(id: 'b', use: 'debug.echo@^0'),
-      ));
+      c.applyGraphEdit(
+        c.graph.withStepAdded(const FlowStep(id: 'b', use: 'debug.echo@^0')),
+      );
       expect(c.isDirty, isTrue);
       c.markSaved();
       expect(c.isDirty, isFalse);