[Feature Request]: T-Deck keyboard and screen lock

[joneyes]

Platform

ESP32

Description

Similar to Alt B toggling keyboard backlight...
Can a Alt L function be added to toggle lock on keyboard, trackball scrolling and screen?
In locked mode display padlock in corner of screen to indicate lock and press trackball to manually wake screen.

[emiliogon]

Please, please add this feature. I'm tired of watching my T-Deck waste power by turning the screen on for unknown reasons, and I'm hesitant to carry it in a pocket because any key presses start sending a message (another UI issue).

I want an assertive, undeniable screen lockout that won't even wake for notifications. I want the reset button to toggle it, because it has no practical use on a device with a power switch.