Add edit page, dialog based item page. Consider switching to popups.

inventory/pages/root_page.py

@@ -27,11 +27,11 @@ class RootPage(rio.Component):
             # of all other components.
             comps.Navbar(),
             # Add some empty space so the navbar doesn't cover the content.
-            rio.Spacer(height=10),
+            rio.Spacer(min_height=10),
             # The page view will display the content of the current page.
             rio.PageView(
                 # Make sure the page view takes up all available space.
-                height="grow",
+                grow_y=True
             ),
             # The footer is also common to all pages, so place it here.
             comps.Footer(),