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/snapshot/manifest.go

@@ -52,6 +52,7 @@ func EncodeManifest(manifest *Manifest, compressionLevel int) ([]byte, error) {
 
 	// Compress using zstd
 	var compressedBuf bytes.Buffer
+
 	writer, err := zstd.NewWriter(&compressedBuf, zstd.WithEncoderLevel(zstd.EncoderLevelFromZstd(compressionLevel)))
 	if err != nil {
 		return nil, fmt.Errorf("creating zstd writer: %w", err)
@@ -59,6 +60,7 @@ func EncodeManifest(manifest *Manifest, compressionLevel int) ([]byte, error) {
 
 	if _, err := writer.Write(jsonData); err != nil {
 		_ = writer.Close()
+
 		return nil, fmt.Errorf("writing compressed data: %w", err)
 	}