Add pending donations to admin donations index

And add more info to the details page

app/controllers/admin/donations_controller.rb

@@ -5,6 +5,7 @@ class Admin::DonationsController < Admin::BaseController
   # GET /donations
   def index
     @pagy, @donations = pagy(Donation.completed.order('paid_at desc'))
+    @pending_donations = Donation.incomplete.order('paid_at desc')
 
     @stats = {
       overall_sats: @donations.sum("amount_sats"),