Multi-Currency Part 2 (#543)

* Support all currencies, handle outside DB

* Remove currencies from seed

* Fix account balance namespace

* Set default currency on authentication

* Cache currency instances

* Implement multi-currency syncs with tests

* Series fallback, passing tests

* Fix conflicts

* Make value group concrete class that works with currency values

* Fix migration conflict

* Update tests to expect multi-currency results

* Update account list to use group method

* Namespace updates

* Fetch unknown exchange rates from API

* Fix date range bug

* Ensure demo data works without external API

* Enforce cascades only at DB level

app/views/accounts/show.html.erb

@@ -8,6 +8,9 @@
       <h2 class="font-medium text-xl"><%= @account.name %></h2>
     </div>
     <div class="flex items-center gap-3">
+      <%= button_to sync_account_path(@account), method: :post, class: "flex items-center gap-2", title: "Sync Account" do %>
+        <%= lucide_icon "refresh-cw", class: "w-4 h-4 text-gray-900 hover:text-gray-500" %>
+      <% end %>
       <div class="relative cursor-not-allowed">
         <div class="flex items-center gap-2 px-3 py-2">
           <span class="text-gray-900"><%= @account.balance_money.currency.iso_code %> <%= @account.balance_money.currency.symbol %></span>