Fix mailbox UI sorting and target layout

backend/06-mbox.go

@@ -12,6 +12,7 @@ import (
 	"net/mail"
 	"os"
 	"path/filepath"
+	"sort"
 	"strings"
 	"time"
 
@@ -166,6 +167,7 @@ func ReadMboxList(path string) ([]MboxEntry, error) {
 			Date:    decodeHeader(msg.Header.Get("Date")),
 		})
 	}
+	sortMboxEntriesByDateDesc(out)
 	return out, nil
 }
 
@@ -467,6 +469,14 @@ func readMboxListFromIndex(path string) ([]MboxEntry, bool) {
 	if err != nil || len(index) == 0 {
 		return nil, false
 	}
+	sort.SliceStable(index, func(i, j int) bool {
+		di := parseMboxIndexDate(index[i].Date)
+		dj := parseMboxIndexDate(index[j].Date)
+		if !di.Equal(dj) {
+			return di.After(dj)
+		}
+		return index[i].Seq > index[j].Seq
+	})
 	out := make([]MboxEntry, 0, len(index))
 	for _, entry := range index {
 		out = append(out, MboxEntry{
@@ -479,6 +489,25 @@ func readMboxListFromIndex(path string) ([]MboxEntry, bool) {
 	return out, true
 }
 
+func sortMboxEntriesByDateDesc(entries []MboxEntry) {
+	sort.SliceStable(entries, func(i, j int) bool {
+		di := parseMboxIndexDate(entries[i].Date)
+		dj := parseMboxIndexDate(entries[j].Date)
+		if !di.Equal(dj) {
+			return di.After(dj)
+		}
+		return entries[i].Index > entries[j].Index
+	})
+}
+
+func parseMboxIndexDate(value string) time.Time {
+	t, err := mail.ParseDate(strings.TrimSpace(value))
+	if err == nil {
+		return t
+	}
+	return time.Time{}
+}
+
 func readMboxMessageFromIndex(path string, index int) ([]byte, bool, error) {
 	accountID, folder, ok := mboxIndexContext(path)
 	if !ok {