docs: start tracking qs-next changelog

changelog/next.md

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+## New Features
+
+- Added support for creating wayland idle inhibitors.
+- Added support for wayland idle timeouts.
+- Changes to desktop entries are now tracked in real time.
+
+## Bug Fixes
+
+- Fixed a crash when running out of disk space to write log files.
+- Fixed a rare crash when disconnecting a monitor.
+- Fixed build issues preventing cross compilation from working.