Stock Picking Show Linked

This module makes it easier to navigate chained warehouse routes. On a transfer form (stock.picking), a new smart button labelled "Previous Transfer" appears next to the existing transfer buttons.

• The button is only shown when there is at least one previous transfer, based on a computed counter (origin_picking_count).
• The counter is calculated automatically from the origin moves of the moves in the current transfer, so it reflects the real chain of documents.
• Clicking the button opens the related previous transfer(s): if there is exactly one, Odoo opens its form directly; if there are several, it opens the list of transfers filtered to those documents.

It touches the stock.picking model and the standard transfer form view. No new menus, reports, emails or scheduled jobs are added. The feature is purely a navigation aid for users who need to trace back the steps of a multi-step route (for example, from a delivery back to the internal transfers or receipts that fed it).