- Custom checklist items in dispatch modal (type + Enter, removable chips)
- Add checklist item input in dispatch detail modal
- SignatureCapture now has proper Full Name field instead of prompt()
- Verified dispatches are read-only: edit hidden, checkboxes disabled, signoff buttons disabled
- Custom items sent as CustomChecklistItems in dispatch payload
- SignatureCapture component: canvas drawing pad + typed mode with cursive preview
- Two sign-off slots in dispatch detail modal: Customer and Vendor
- Collect Signature button opens capture modal, prompts for name
- Signed slots show signature thumbnail, name, and timestamp
- Green "All Signed" badge when both complete
- addDispatchSignoff API function
