daemon/powerdevilcore: recheck battery level on session unlock

Ramil Nurmanovrequested to merge
ramilnur/powerdevil:feature/notify-unlock-session into master

Implemented repeated low-battery notifications on session unlock. Added a new slot onScreenLockerActiveChanged() and connected it to PolicyAgent::screenLockerActiveChanged. When the screen is unlocked (active == false), PowerDevil checks the current battery level again. If the percentage is below batteryLowLevel or batteryCriticalLevel, the corresponding notification is displayed. This makes low-battery warnings appear not only at daemon startup but also after session unlock, such as returning from sleep or unlocking the screen.

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