Stock Picking Date Deadline syncs Scheduled Date

This module adds a small automatic rule to stock operations in Odoo Inventory.

• When someone changes the Deadline Date on a stock move, the Scheduled Date is automatically updated to the same date and time.
• The rule is applied through the stock.move model, so it covers the underlying move lines of transfers, deliveries and receipts, not only the picking header.
• Because the update happens inside the same save operation, users do not need to edit the Scheduled Date manually after changing the Deadline Date.
• The module does not add any new menu, screen, button or report; it only changes how existing date fields behave.
• No new fields, checks, emails or scheduled jobs are introduced by the code.

In practice, this helps planners and warehouse staff keep the two dates consistent when another module or process updates the Deadline Date, avoiding mismatches between the deadline and the planned execution date.