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/chunker/chunker.go

@@ -3,6 +3,7 @@ package chunker
 import (
 	"crypto/sha256"
 	"encoding/hex"
+	"errors"
 	"fmt"
 	"io"
 	"os"
@@ -50,13 +51,15 @@ func (c *Chunker) ChunkReader(r io.Reader) ([]Chunk, error) {
 	defer chunker.Release()
 
 	var chunks []Chunk
+
 	offset := int64(0)
 
 	for {
 		chunk, err := chunker.Next()
-		if err == io.EOF {
+		if errors.Is(err, io.EOF) {
 			break
 		}
+
 		if err != nil {
 			return nil, fmt.Errorf("reading chunk: %w", err)
 		}
@@ -104,9 +107,10 @@ func (c *Chunker) ChunkReaderStreaming(r io.Reader, callback ChunkCallback) (str
 
 	for {
 		chunk, err := chunker.Next()
-		if err == io.EOF {
+		if errors.Is(err, io.EOF) {
 			break
 		}
+
 		if err != nil {
 			return "", fmt.Errorf("reading chunk: %w", err)
 		}
@@ -143,7 +147,8 @@ func (c *Chunker) ChunkFile(path string) ([]Chunk, error) {
 		return nil, fmt.Errorf("opening file: %w", err)
 	}
 	defer func() {
-		if err := file.Close(); err != nil && err.Error() != "invalid argument" {
+		err := file.Close()
+		if err != nil && err.Error() != "invalid argument" {
 			// Log error or handle as needed
 			_ = err
 		}