Paste From Clipboard

1. Add a button to copy the tracking number from the clipboard on the 'add a parcel' page.
2. Automatically detect the number and ask if it should be added when you open the app(maybe add this request as a option in the settings).

Start by locating the “add a parcel” page, the app-open entry point, and the settings screen. Clarify whether both clipboard actions are required and whether automatic detection is optional; done means the requested clipboard flow works and the setting, if included, controls detection.

Written by the indexing model from the issue text.