Issue time estimate, meaningful time tracking (#23113)

Redesign the time tracker side bar, and add "time estimate" support (in "1d 2m" format)

Closes #23112

---------

Co-authored-by: stuzer05 <stuzer05@gmail.com>
Co-authored-by: Yarden Shoham <hrsi88@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

modules/templates/helper.go

@@ -70,6 +70,9 @@ func NewFuncMap() template.FuncMap {
 		"FileSize": base.FileSize,
 		"CountFmt": base.FormatNumberSI,
 		"Sec2Time": util.SecToTime,
+
+		"TimeEstimateString": timeEstimateString,
+
 		"LoadTimes": func(startTime time.Time) string {
 			return fmt.Sprint(time.Since(startTime).Nanoseconds()/1e6) + "ms"
 		},
@@ -282,6 +285,14 @@ func userThemeName(user *user_model.User) string {
 	return setting.UI.DefaultTheme
 }
 
+func timeEstimateString(timeSec any) string {
+	v, _ := util.ToInt64(timeSec)
+	if v == 0 {
+		return ""
+	}
+	return util.TimeEstimateString(v)
+}
+
 func panicIfDevOrTesting() {
 	if !setting.IsProd || setting.IsInTesting {
 		panic("legacy template functions are for backward compatibility only, do not use them in new code")