chore: update Go to 1.26.1, fix goimports formatting, add tests

- Update go.mod from Go 1.26.0 to 1.26.1
- Update dependencies: golang.org/x/sync, golang.org/x/sys,
  charmbracelet/x/exp/charmtone, mattn/go-runewidth
- Fix goimports formatting in 10 files
- Add apk/normalize_test.go: tests for normalizeName and
  parseArchNormalize with all known arch suffixes
- Add rpm/parse_test.go: tests for parseList, parseInfo,
  parseArchSuffix, and normalizeName (all at 100% coverage)
- All tests pass with -race, staticcheck and go vet clean

apt/capabilities_linux.go

@@ -191,7 +191,6 @@ func listRepos(_ context.Context) ([]snack.Repository, error) {
 	return repos, nil
 }
 
-
 func addRepo(ctx context.Context, repo snack.Repository) error {
 	repoLine := repo.URL
 	if repo.Type != "" {