E-book viewer: Hide the controls when clicking the back or forward buttons

src/pyj/read_book/iframe.pyj

@@ -653,7 +653,6 @@ class IframeBoss:
     def send_message(self, action, **data):
         self.comm.send_message(action, data)
 
-
     def connect_links(self):
         for a in document.body.querySelectorAll(f'a[{self.link_attr}]'):
             a.addEventListener('click', self.link_activated)

src/pyj/read_book/overlay.pyj

@@ -428,9 +428,11 @@ class MainOverlay:  # {{{
 
     def back(self):
         window.history.back()
+        self.overlay.hide()
 
     def forward(self):
         window.history.forward()
+        self.overlay.hide()
 
 # }}}