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Implement Cross-Window Drop Validation and Topology Rules #8166

@tobiu

Description

@tobiu

For complex workspaces (like AgentOS), we need granular control over which dashboards can receive items from which sources.

Current State:
We use sortGroup string matching. This is binary (all-or-nothing).

Goal:
Implement a robust validation hook or Topology Manager.

  • Validator Hook: allowDrop(draggedItem, sourceZone, targetZone) => boolean.
  • Use Cases:
    • Prevent dropping "System Widgets" into "User Content" areas.
    • Allow Child -> Parent drops, but block Parent -> Child.
    • Enforce "One instance only" rules.

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