Show cash + holdings value for investment account view (#1046)

* Handle missing tickers in security price syncs

* Show combined cash and holdings value on account page

* Improve partial locals

config/routes.rb

@@ -79,6 +79,7 @@ Rails.application.routes.draw do
       resource :logo, only: :show
 
       resources :holdings, only: %i[ index new show ]
+      resources :cashes, only: :index
 
       resources :entries, except: :index do
         collection do