Ctrl+V for nested attributes

Adding choices for Dropdown, MultiSelect, Category, and Nested Dropdown attributes no longer has to be one at a time. Copy values from Excel, Google Sheets, or any text source and paste them directly into the choice input field.

• Automatic hierarchy for nested dropdowns — Paste tab-separated or comma-separated data and the nested structure builds itself
• Smart cleanup — Bullet prefixes, empty lines, and duplicates are handled automatically
• Works across Requests, Changes, Assets, and People settings