Add displays card to utilities drawer

[salah-chafai]

New panel for managing connected outputs. Lists each detected display, marks the primary (the one focused), and lets you toggle secondary outputs on/off and choose to set them to extend or mirror (a specified display).

Known issue
Flameshot sometimes behaves incorrectly with multiple screens active. There are existing reports of flameshot multi-monitor issues unrelated to this shell (e.g.
flameshot-org/flameshot#4385), so it might just be that, but I'm not sure whether the way I implemented mirror/extend here contributes. Would appreciate someone with more experience taking a look at the root cause.

[Chujo58]

Honestly this sounds like a really neat feature. Could be worth to put this in the control center once it's done being reworked?
Also I've just noticed that you expect the ~/.config/hypr/caelestia-display.conf to exist, which I guess would hold the information for the monitors setup. Might be worth to instead move that to where the hypr-user.conf and hypr-vars.conf are.
Also worth mentioning that hyprland is "soonish" changing their configuration language to lua, so this might not work anymore?

[salah-chafai]

@Chujo58 Yes, once the control center is reworked we can have a panel for all monitor configs (resolution, position, scale...).
You're right, changed it to ~/.config/caelestia/hypr-displays.conf.
Concerning the last point, I think we'd just update to the new configuration language once it's rolled out?

[Chujo58]

Oh yeah we can change the language once it's rolled out to stable hyprland. I believe someone is already working on doing that fix for the general dots. But this is a really neat feature. My monitor setup is uhhhhhhhhh terrible and I remind myself of it all the time but never fix it since I don't often use external monitors.

[salah-chafai]

This is ready for review if no one has any suggestions