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/config/size.go

@@ -1,6 +1,7 @@
 package config
 
 import (
+	"errors"
 	"fmt"
 
 	"github.com/dustin/go-humanize"
@@ -14,18 +15,19 @@ type Size int64
 // UnmarshalYAML implements yaml.Unmarshaler for Size, allowing it to be
 // parsed from YAML configuration files. It accepts both numeric values
 // (interpreted as bytes) and string values with units (e.g., "10MB").
-func (s *Size) UnmarshalYAML(unmarshal func(interface{}) error) error {
+func (s *Size) UnmarshalYAML(unmarshal func(any) error) error {
 	// Try to unmarshal as int64 first
 	var intVal int64
 	if err := unmarshal(&intVal); err == nil {
 		*s = Size(intVal)
+
 		return nil
 	}
 
 	// Try to unmarshal as string
 	var strVal string
 	if err := unmarshal(&strVal); err != nil {
-		return fmt.Errorf("size must be a number or string")
+		return errors.New("size must be a number or string")
 	}
 
 	// Parse the string using go-humanize
@@ -35,6 +37,7 @@ func (s *Size) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	}
 
 	*s = Size(bytes)
+
 	return nil
 }
 
@@ -58,5 +61,6 @@ func ParseSize(s string) (Size, error) {
 	if err != nil {
 		return 0, fmt.Errorf("invalid size format: %w", err)
 	}
+
 	return Size(bytes), nil
 }