Apply mechanical lint fixes for golangci-lint v2.12.2 rollout

Auto-remediate style-only findings (wsl_v5, nlreturn, noinlineerr,
modernize, intrange, perfsprint, usetesting, unconvert, errorlint,
gocritic, testifylint) and rename printf-style helpers to f-suffixed
names (goprintffuncname): ui.Writer message methods, cli.ReportErrorf,
database.Fatalf, vaultik stdoutf.

internal/cli/duration.go

@@ -1,6 +1,7 @@
 package cli
 
 import (
+	"errors"
 	"fmt"
 	"regexp"
 	"strconv"
@@ -25,7 +26,7 @@ func parseDuration(s string) (time.Duration, error) {
 	// Extended duration parsing
 	// Check for negative values
 	if strings.HasPrefix(strings.TrimSpace(s), "-") {
-		return 0, fmt.Errorf("negative durations are not supported")
+		return 0, errors.New("negative durations are not supported")
 	}
 
 	// Pattern matches: number + unit, repeated
@@ -48,6 +49,7 @@ func parseDuration(s string) (time.Duration, error) {
 		}
 
 		var d time.Duration
+
 		switch unit {
 		// Standard time units
 		case "ns", "nanosecond", "nanoseconds":
@@ -75,7 +77,7 @@ func parseDuration(s string) (time.Duration, error) {
 			d = time.Duration(value * float64(365*24*time.Hour))
 		default:
 			// Try parsing as standard Go duration unit
-			testStr := fmt.Sprintf("1%s", unit)
+			testStr := "1" + unit
 			if _, err := time.ParseDuration(testStr); err == nil {
 				// It's a valid Go duration unit, parse the full value
 				fullStr := fmt.Sprintf("%g%s", value, unit)