fix: resolve all nlreturn linter errors

Add blank lines before return statements in all files to satisfy
the nlreturn linter. This improves code readability by providing
visual separation before return statements.

Changes made across 24 files:
- internal/cli/*.go
- internal/secret/*.go
- internal/vault/*.go
- pkg/agehd/agehd.go
- pkg/bip85/bip85.go

All 143 nlreturn issues have been resolved.

internal/cli/crypto.go

@@ -236,6 +236,7 @@ func (cli *Instance) Decrypt(secretName, inputFile, outputFile string) error {
 // isValidAgeSecretKey checks if a string is a valid age secret key by attempting to parse it
 func isValidAgeSecretKey(key string) bool {
 	_, err := age.ParseX25519Identity(key)
+
 	return err == nil
 }
 
@@ -244,11 +245,11 @@ func (cli *Instance) getSecretValue(vlt *vault.Vault, secretObj *secret.Secret)
 	if os.Getenv(secret.EnvMnemonic) != "" {
 		return secretObj.GetValue(nil)
 	}
-	
+
 	unlocker, err := vlt.GetCurrentUnlocker()
 	if err != nil {
 		return nil, fmt.Errorf("failed to get current unlocker: %w", err)
 	}
-	
+
 	return secretObj.GetValue(unlocker)
 }