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/prune.go

@@ -2,6 +2,7 @@ package cli
 
 import (
 	"context"
+	"errors"
 	"os"
 
 	"github.com/spf13/cobra"
@@ -39,6 +40,7 @@ work (e.g. after a crashed backup or to reclaim storage).`,
 
 			// Use the app framework like other commands
 			rootFlags := GetRootFlags()
+
 			return RunWithApp(cmd.Context(), AppOptions{
 				ConfigPath: configPath,
 				LogOptions: log.LogOptions{
@@ -54,26 +56,31 @@ work (e.g. after a crashed backup or to reclaim storage).`,
 								// Start the prune operation in a goroutine
 								go func() {
 									// Run the prune operation
-									if err := v.Prune(opts); err != nil {
-										if err != context.Canceled {
+									err := v.Prune(opts)
+									if err != nil {
+										if !errors.Is(err, context.Canceled) {
 											if !opts.JSON {
 												log.Error("Prune operation failed", "error", err)
-												ReportError("Prune failed: %v", err)
+												ReportErrorf("Prune failed: %v", err)
 											}
+
 											os.Exit(1)
 										}
 									}
 
 									// Shutdown the app when prune completes
-									if err := v.Shutdowner.Shutdown(); err != nil {
+									err = v.Shutdowner.Shutdown()
+									if err != nil {
 										log.Error("Failed to shutdown", "error", err)
 									}
 								}()
+
 								return nil
 							},
 							OnStop: func(ctx context.Context) error {
 								log.Debug("Stopping prune operation")
 								v.Cancel()
+
 								return nil
 							},
 						})