WIP Add wallet transactions route, view

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

app/components/wallet_summary_component.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+class WalletSummaryComponent < ViewComponent::Base
+  def initialize(balance:)
+    @balance = balance
+  end
+
+end