fix: resolve frontend TypeScript build errors

- DirectiveDAG: fix layer rendering (afterSteps -> layer.steps with
  StepNode), remove unused imports (StepNode re-added, BEFORE_TYPES
  and OrchestratorStepNode removed)
- DirectiveDetail: remove dead virtualSteps code superseded by
  specializedSteps
- useMultiTaskSubscription: remove duplicate backfilledTasksRef
  declaration and dead backfillTask/convertTaskEventToEntry block
  referencing non-existent TaskEvent and listTaskEvents

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

3 files changed, 7 insertions, 46 deletions

diff --git a/makima/frontend/src/components/directives/DirectiveDAG.tsx b/makima/frontend/src/components/directives/DirectiveDAG.tsx
index 8c7def9..142df41 100644
--- a/makima/frontend/src/components/directives/DirectiveDAG.tsx
+++ b/makima/frontend/src/components/directives/DirectiveDAG.tsx
@@ -2,7 +2,6 @@ import { useMemo } from "react";
 import type { DirectiveStep } from "../../lib/api";
 import { StepNode } from "./StepNode";
 import {
-  OrchestratorStepNode,
   type OrchestratorStepType,
   type OrchestratorStepStatus,
 } from "./OrchestratorStepNode";
@@ -35,13 +34,6 @@ interface Layer {
   steps: DirectiveStep[];
 }
 
-/** Types that should appear before the regular DAG steps */
-const BEFORE_TYPES = new Set<OrchestratorStepType>([
-  "planning",
-  "replanning",
-  "plan-orders",
-]);
-
 function topoSort(steps: DirectiveStep[]): Layer[] {
   if (steps.length === 0) return [];
 
@@ -97,14 +89,13 @@ export function DirectiveDAG({ steps, specializedSteps, onComplete, onFail, onSk
             </div>
           )}
           <div className="flex flex-wrap gap-3 justify-center">
-            {afterSteps.map((vs) => (
-              <OrchestratorStepNode
-                key={`${vs.type}-${vs.taskId}`}
-                type={vs.type}
-                taskId={vs.taskId}
-                status={vs.status}
-                label={vs.label}
-                hasQuestions={vs.hasQuestions}
+            {layer.steps.map((step) => (
+              <StepNode
+                key={step.id}
+                step={step}
+                onComplete={onComplete ? () => onComplete(step.id) : undefined}
+                onFail={onFail ? () => onFail(step.id) : undefined}
+                onSkip={onSkip ? () => onSkip(step.id) : undefined}
               />
             ))}
           </div>
diff --git a/makima/frontend/src/components/directives/DirectiveDetail.tsx b/makima/frontend/src/components/directives/DirectiveDetail.tsx
index 171654d..8f39207 100644
--- a/makima/frontend/src/components/directives/DirectiveDetail.tsx
+++ b/makima/frontend/src/components/directives/DirectiveDetail.tsx
@@ -177,35 +177,6 @@ export function DirectiveDetail({
     setEditingGoal(false);
   };
 
-  // Build virtual steps for orchestrator tasks to display in the DAG
-  const virtualSteps = useMemo(() => {
-    const steps: VirtualStep[] = [];
-    if (directive.orchestratorTaskId) {
-      const hasOrchestratorQuestions = directiveQuestions.some(
-        (q) => q.taskId === directive.orchestratorTaskId
-      );
-      steps.push({
-        type: "planning",
-        taskId: directive.orchestratorTaskId,
-        status: "running",
-        label: "Planning",
-        hasQuestions: hasOrchestratorQuestions,
-      });
-    }
-    if (directive.completionTaskId) {
-      const hasCompletionQuestions = directiveQuestions.some(
-        (q) => q.taskId === directive.completionTaskId
-      );
-      steps.push({
-        type: directive.prUrl ? "pr-update" : "pr",
-        taskId: directive.completionTaskId,
-        status: "running",
-        label: directive.prUrl ? "Updating PR" : "Creating PR",
-        hasQuestions: hasCompletionQuestions,
-      });
-    }
-    return steps;
-  }, [directive.orchestratorTaskId, directive.completionTaskId, directive.prUrl, directiveQuestions]);
 
   return (
     <div className="flex flex-col h-full overflow-y-auto">
diff --git a/makima/frontend/src/hooks/useMultiTaskSubscription.ts b/makima/frontend/src/hooks/useMultiTaskSubscription.ts
index b229e90..84b9366 100644
--- a/makima/frontend/src/hooks/useMultiTaskSubscription.ts
+++ b/makima/frontend/src/hooks/useMultiTaskSubscription.ts
@@ -28,7 +28,6 @@ export function useMultiTaskSubscription(options: UseMultiTaskSubscriptionOption
   const wsRef = useRef<WebSocket | null>(null);
   const reconnectTimeoutRef = useRef<number | null>(null);
   const subscribedTasksRef = useRef<Set<string>>(new Set());
-  const backfilledTasksRef = useRef<Set<string>>(new Set());
   const taskMapRef = useRef(taskMap);
   const enabledRef = useRef(enabled);