Checkmark states rework for better tracking and consistency

android/uhabits-android/src/main/java/org/isoron/uhabits/widgets/views/CheckmarkTimeWidgetView.java

@@ -56,8 +56,9 @@ public class CheckmarkTimeWidgetView extends CheckmarkWidgetView {
         if (isNumerical) return NumberButtonViewKt.toShortString(checkmarkValue / 1000.0);
         switch (checkmarkState) {
             case Checkmark.CHECKED_EXPLICITLY:
-            case Checkmark.CHECKED_IMPLICITLY:
                 return getResources().getString(R.string.fa_check);
+            case Checkmark.CHECKED_IMPLICITLY:
+                return newest == null ? getResources().getString(R.string.fa_check) : newest.getTimestamp().daysUntil(new Timestamp(System.currentTimeMillis())) + getResources().getString(R.string.fa_check);
             case Checkmark.SKIPPED:
                 return getResources().getString(R.string.fa_skipped);
             case Checkmark.UNCHECKED: