Review and update design for "Delivery address same as mailing address" feature

Based on:
https://app.zenhub.com/workspaces/entities-team-space-6143567664fb320019b81f39/issues/gh/bcgov/entity/16521

- [ ] When the mailing address is outside of BC, the button "Delivery address same as mailing address" is blocked
- [ ] No explanation is given to the user, which makes it maybe confusing

To Do List:

- [ ] Update the design with messages, tool tips, functionality, etc., to better mitigate this situation.

Start by reviewing the linked issue 16521 and the current mailing-address form flow where the “Delivery address same as mailing address” button is blocked for addresses outside BC. Define the explanatory message, tooltip, or interaction changes needed, then confirm the design clearly explains the restriction and supports the intended user flow.

Written by the indexing model from the issue text.