add Favorites page and toggle favorite button to album page

ui/widgets/favoritebutton.go

@@ -0,0 +1,40 @@
+package widgets
+
+import (
+	"supersonic/res"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/widget"
+)
+
+type FavoriteButton struct {
+	widget.Button
+
+	IsFavorited bool
+}
+
+func NewFavoriteButton(onTapped func()) *FavoriteButton {
+	f := &FavoriteButton{
+		Button: widget.Button{
+			OnTapped: onTapped,
+			Icon:     res.ResHeartOutlineInvertPng,
+		},
+	}
+	f.ExtendBaseWidget(f)
+	return f
+}
+
+func (f *FavoriteButton) Tapped(e *fyne.PointEvent) {
+	f.IsFavorited = !f.IsFavorited
+	f.Button.Tapped(e)
+	f.Refresh()
+}
+
+func (f *FavoriteButton) Refresh() {
+	if f.IsFavorited {
+		f.Icon = res.ResHeartFilledInvertPng
+	} else {
+		f.Icon = res.ResHeartOutlineInvertPng
+	}
+	f.Button.Refresh()
+}