Power Display - Add input selection for profiles

### Description of the new feature / enhancement

Allow per monitor input selection within the Power Display profiles.

### Scenario when this would be used?

For monitors with multiple devices connected (computer, Blu-ray player, etc.) this would allow saved profiles for specific activities: computer productivity or gaming, watching Blu-ray discs, etc.

This can also be expanded for multiple monitor setups to easily switch inputs on all monitors. For example, I have a Dell monitor with a built-in KVM. I connect multiple computers to this monitor (Home, Work). Each computer is also connected to a secondary monitor on a different port. Switching between saved profiles could change the input on one or more monitors to allow easy switching between home and work computers.

### Supporting information

_No response_

No files or tests are named. Start by locating the Power Display profile implementation and the monitor input-handling entry points; define how profiles select inputs for one or more monitors, then verify that saved profiles switch the requested displays as described.

Written by the indexing model from the issue text.