fix(web): allow workflow graph view to load without a codebase (#958)

The useQuery for workflow definitions required both workflowName and
codebaseCwd to be truthy. For CLI-triggered runs or "No project" web
runs where codebase_id is null, codebaseCwd stays undefined and the
query never fires — showing "Loading graph..." forever. The server
already handles missing cwd by falling back to bundled defaults, so
the client gate only needs workflowName.

Fixes #958

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: coleam00

packages/web/src/components/workflows/WorkflowExecution.tsx

@@ -235,12 +235,12 @@ export function WorkflowExecution({ runId }: WorkflowExecutionProps): React.Reac
   }, [codebaseId]);
 
   // Fetch workflow definition for DAG topology (depends_on edges).
-  // Enabled whenever we have a workflow name and cwd — isDag is derived from the result,
-  // not used as a gate, to avoid a circular dependency.
+  // Only gated on workflowName — codebaseCwd is optional; the server falls back to bundled
+  // defaults when cwd is absent (handles CLI runs and "No project" web runs).
   const { data: workflowDef } = useQuery({
     queryKey: ['workflowDefinition', initialData?.workflowName, codebaseCwd],
     queryFn: () => getWorkflow(initialData?.workflowName ?? '', codebaseCwd ?? undefined),
-    enabled: !!initialData?.workflowName && !!codebaseCwd,
+    enabled: !!initialData?.workflowName,
     staleTime: Infinity,
   });
   const dagDefinitionNodes = workflowDef?.workflow?.nodes ?? null;