Implemented admin pane + user permission

internal/datasource/synthetic/graph.go

@@ -52,7 +52,20 @@ func (rg *runtimeGraph) sourceRefs() []broker.SignalRef {
 //   - stateful ops (filters) and lua are scalar-only; an array input errors,
 //     since their per-evaluation state cannot be split across array lanes.
 func (rg *runtimeGraph) evalSample(sourceVals map[string]dsp.Sample) (dsp.Sample, error) {
-	vals := make(map[string]dsp.Sample, len(rg.order))
+	vals, err := rg.evalSampleTrace(sourceVals)
+	if err != nil {
+		return dsp.Sample{}, err
+	}
+	return vals[rg.outputID], nil
+}
+
+// evalSampleTrace runs a full forward pass like evalSample but returns the value
+// computed for *every* node (sources, ops and the output), keyed by node id. It
+// is used by the editor's live/debug trace to show each node's current value.
+// On an op error it returns the values computed so far together with the error,
+// so partial results can still be displayed.
+func (rg *runtimeGraph) evalSampleTrace(sourceVals map[string]dsp.Sample) (map[string]dsp.Sample, error) {
+	vals := make(map[string]dsp.Sample, len(rg.order)+len(sourceVals))
 	for id, v := range sourceVals {
 		vals[id] = v
 	}
@@ -65,7 +78,7 @@ func (rg *runtimeGraph) evalSample(sourceVals map[string]dsp.Sample) (dsp.Sample
 			}
 			r, err := evalOp(n, in)
 			if err != nil {
-				return dsp.Sample{}, fmt.Errorf("node %s (%s): %w", n.id, n.op.Type(), err)
+				return vals, fmt.Errorf("node %s (%s): %w", n.id, n.op.Type(), err)
 			}
 			vals[n.id] = r
 		case "output":
@@ -74,7 +87,7 @@ func (rg *runtimeGraph) evalSample(sourceVals map[string]dsp.Sample) (dsp.Sample
 			}
 		}
 	}
-	return vals[rg.outputID], nil
+	return vals, nil
 }
 
 // evalOp runs a single op node over its Sample inputs, choosing the right