feat(workflow): add clear button to workflow test run panel

Features:
- Add refresh button to clear test run history (data, inputs, node highlights)
- Persist workflowRunningData when closing panel (from previous commit)

Code quality improvements:
- Refactor to declarative pattern: effectiveTab derived from state, not set in effects
- Replace && with ternary operators for conditional rendering (Vercel best practices)
- Fix created_by type: change from string to object to match backend API
- Remove `as any` type assertion, use proper type-safe access
- Title now declaratively shows status based on workflowRunningData presence

Files changed:
- use-workflow-interactions.ts: add handleClearWorkflowRunHistory hook
- workflow-preview.tsx: declarative tab state, clear button, type-safe props
- types.ts: fix created_by type definition
- test files: update mock data to match corrected types

web/app/components/workflow/hooks/use-workflow-interactions.ts

@@ -51,8 +51,19 @@ export const useWorkflowInteractions = () => {
     }
   }, [workflowStore, handleNodeCancelRunningStatus, handleEdgeCancelRunningStatus])
 
+  const handleClearWorkflowRunHistory = useCallback(() => {
+    workflowStore.setState({
+      workflowRunningData: undefined,
+      inputs: {},
+      files: [],
+    })
+    handleNodeCancelRunningStatus()
+    handleEdgeCancelRunningStatus()
+  }, [workflowStore, handleNodeCancelRunningStatus, handleEdgeCancelRunningStatus])
+
   return {
     handleCancelDebugAndPreviewPanel,
+    handleClearWorkflowRunHistory,
   }
 }