* fix(brightness): refresh sysfs cache on hotplug
The SysfsBackend used a cache that was never refreshed on display hot plug, causing new backlight devices to not appear in IPC until restart.
This adds Rescan() to SysfsBackend and calls it in Manager.Rescan(), matching the behavior of DDCBackend.
Fixes: hotplugged external monitor brightness control via IPC
* make fmt
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Co-authored-by: bbedward <bbedward@gmail.com>
- fork go-wayland/client and modify to make it thread-safe internally
- use sync.Map and atomic values in many places to cut down on mutex
boilerplate
- do not create extworkspace client unless explicitly requested
