[WIP] Add global toggle hotkey for display settings

[Copilot]

• Review current settings, hotkey handling, and profile application flow
• Add settings persistence for global toggle hotkey and enablement
• Update UI to expose toggle enable checkbox and hotkey mapping
• Implement global toggle logic to apply/reset per-app vibrance/brightness/contrast/gamma
• Add/adjust tests if feasible and run targeted validation
• Run code review and security scan

Original prompt

I want a new branch and feature - I want to be able to change the settings like vibrance, ingame brightness, ingame contrast and ingame gamma with a global toggle hotkey that will toggle the settings applied for the current running application, if toggled off everything will go back to default value, if toggled on the profile kicks in again, by default when starting an application it should be on the same as the current behaviour, dont do anything with resolution, so enabling this feature will have to be a tickbox in the settings, if the tickbox is selected an option to map the hotkey will appear, for example users may map it to F12 or alt+c or alt+shift+x etc.

to note for brightness, contrast and gamma to be enabled a never change color settings tickbox has to be unselected - not sure this will change your implementation but good to consider. write good clean code that the repo mainter will want to merge.

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