Add Makefile targets for go vet and go fix, use named struct fields in tests, apply go fix improvements

models/entry.go

@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"maps"
 	"os"
 	"regexp"
 	"strings"
@@ -34,7 +35,7 @@ func (e Entry) getFieldMarshalChan() chan metaRes {
 	ch := make(chan metaRes, size)
 	var wg sync.WaitGroup
 
-	for i := 0; i < size; i++ {
+	for i := range size {
 		wg.Add(1)
 		go func(m Meta) {
 			defer wg.Done()
@@ -139,8 +140,8 @@ func scanEntry(data []byte, atEOF bool) (advance int, token []byte, err error) {
 	if atEOF {
 		end := []byte{32, 64, 101, 110, 100}
 		token = data
-		if i := bytes.Index(data, end); i >= 0 {
-			token = data[0:i]
+		if before, _, ok := bytes.Cut(data, end); ok {
+			token = before
 		}
 		return len(data), token, nil
 	}
@@ -198,9 +199,7 @@ func (e Entry) MarshalJSON() ([]byte, error) {
 	out := map[string]any{}
 	out["title"] = e.Title
 	out["date"] = e.Date.Format(time.RFC3339)
-	for k, v := range e.Fields.Map() {
-		out[k] = v
-	}
+	maps.Copy(out, e.Fields.Map())
 	return json.Marshal(out)
 }