WIP Add wallet transactions route, view

Adds a new component for the wallet summary as well, and makes the
component tests work with RSpec.

config/routes.rb

@@ -20,6 +20,7 @@ Rails.application.routes.draw do
   resources :donations
 
   get 'wallet', to: 'wallet#index'
+  get 'wallet/transactions', to: 'wallet#transactions'
 
   get 'lnurlpay/:address', to: 'lnurlpay#index', constraints: { address: /[^\/]+/}
   get 'lnurlpay/:address/invoice', to: 'lnurlpay#invoice', constraints: { address: /[^\/]+/}