Saved Search - Modal buttons unresponsive [MJ-335]

Saving a search seems to have been hanging because of how refreshing the search list was implemented.

Previously, this was done by reloading the entire page. It is now more like profiles in that items are dynamically added/removed.

Saving can still be a little slow at times, but it does not block the UI as it did previously.

All tests (JS and Python) pass.