refactor: simplify path policy and TUI reducers

internal/profile/store.go

@@ -14,6 +14,7 @@ import (
 
 	"golang.org/x/sys/unix"
 
+	"proxyctl/internal/pathutil"
 	"proxyctl/internal/securefs"
 )
 
@@ -184,10 +185,7 @@ func ConfigPathWith(environment IdentityEnvironment) (string, error) {
 	return configuration.Path, err
 }
 
-func pathWithin(path, parent string) bool {
-	relative, err := filepath.Rel(parent, path)
-	return err == nil && relative != ".." && !strings.HasPrefix(relative, ".."+string(filepath.Separator))
-}
+func pathWithin(path, parent string) bool { return pathutil.Within(path, parent) }
 
 type CommitError struct {
 	Err error