Fix positioning and scrolling of input field picker in human input form

{
  "event_id": "event_7261d4681378e5ad",
  "topic_id": "consumer_ai_applications",
  "event_type": "Pull Request",
  "event_time": "2026-06-05T08:47:41Z",
  "title": "Fix positioning and scrolling of input field picker in human input form",
  "summary": "The Human Input add-field picker panel is repositioned to stay beside the node panel with a 4px gap, and its header and footer are fixed while the body scrolls, with tests added for the new layout.",
  "contribution": "Corrects the UI positioning and scrolling behavior of the field addition panel within the human input form, preventing it from obscuring content or behaving inconsistently.",
  "impact": "Builders using Dify to create consumer AI workflows will experience a more predictable and less cluttered interface when configuring human input steps, reducing accidental mis-clicks and making the form easier to use. This is important because a core interaction point in the application-building process becomes more reliable. Watch for similar layout fixes in other panels to see if a consistent design pattern emerges.",
  "maturity": "Code",
  "confidence": 0,
  "importance_score": 0.62,
  "risk_flags": [
    "Ui Regression"
  ],
  "evidence_count": 1
}