- Create useDropdownMenuSubHoverDelay hook in dropdown-menu component
- Encapsulates hover delay behavior for preventing accidental submenu closure
- Eliminates code duplication at component usage sites
- Simplifies InsertMenu by removing 45 lines of timeout/state management code
- Hook provides handleTriggerEnter/Leave and handleContentEnter/Leave handlers
- Configurable closeDelay parameter (default 150ms)

This makes the hover behavior pattern reusable across any dropdown menu submenus.

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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>