split due into 'due today' and 'overdue'

ftl/core/browsing.ftl

@@ -129,3 +129,4 @@ browsing-again-today = Again
 browsing-edited-today = Edited
 browsing-sidebar-due-today = Due
 browsing-sidebar-untagged = Untagged
+browsing-sidebar-overdue = Overdue

qt/aqt/sidebar.py

@@ -640,7 +640,7 @@ class SidebarTreeView(QTreeView):
             name=TR.BROWSING_SIDEBAR_DUE_TODAY,
             icon=icon,
             type=type,
-            on_click=search(SearchTerm(card_state=SearchTerm.CARD_STATE_DUE)),
+            on_click=search(SearchTerm(due_on_day=0)),
         )
         root.add_simple(
             name=TR.BROWSING_ADDED_TODAY,
@@ -670,6 +670,15 @@ class SidebarTreeView(QTreeView):
                 )
             ),
         )
+        root.add_simple(
+            name=TR.BROWSING_SIDEBAR_OVERDUE,
+            icon=icon,
+            type=type,
+            on_click=search(
+                SearchTerm(card_state=SearchTerm.CARD_STATE_DUE),
+                SearchTerm(negated=SearchTerm(due_on_day=0)),
+            ),
+        )
 
     # Tree: Card State
     ###########################