make optimisation from scan do run_ai_on_path IF there are newer reference images than the last scan even if we dont find new files in the scan itself

TODO

@@ -1,4 +1,9 @@
 ## GENERAL
+    * going forward into search page (and probably all POSTs) does not work - no data posted (e.g. no search term)
+        - use replaceState in routes I know use POST and I need to keep data, try search first
+            https://developer.mozilla.org/en-US/docs/Web/API/WindowEventHandlers/onpopstate
+
+
     * per file you could select an unknown face and add it as a ref img to an existing person, or make a new person and attach?
         * [DONE] order/ find face with largest size and at least show that as unmatched
             - could also try to check it vs. other faces, if it matches more than say 10? we offer it up as a required ref img, then cut that face (with margin) out and use it is a new ref image / person