Refactor pre-commit hooks to use prek (#976)

* ci: change to prek for pre-commit

* refactor: fix shellcheck warnings for the scripts

* chore: unify whitespace formatting

* nix: add prek to dev shell

quickshell/qmlformat-all.sh

@@ -4,4 +4,4 @@
 find . -name "*.qml" -exec sh -c '
     qmlfmt -t 4 -i 4 -b 250 -w "$1"
     sed -i "s/pragma ComponentBehavior$/pragma ComponentBehavior: Bound/g" "$1"
-' _ {} \;
+' _ {} \;