Implement basic transaction pagination (#531)

* install pagy

* add pagy to controller, display default pagy UI

* display hardcoded custom UI to confirm styling

* implement custom UI with pagy methods

* move pagination into partial

* use lucide icons

* only display pagination if 2 or more pages are available

* add mobile pagination placeholder

* use link_to and display greyed out buttons when no prev or next needed

* sort transactions by date so grouping works appropriately with pagination

* add space between mobile view buttons

* remove debugging

app/views/transactions/index.html.erb

@@ -70,6 +70,11 @@
           <%= render partial: "transactions/transaction_group", locals: { date: date, transactions: grouped_transactions } %>
         <% end %>
       </div>
+      <% if @pagy.pages > 1 %>
+        <nav class="flex items-center justify-center px-4 sm:px-0">
+          <%= render partial: "transactions/pagination", locals: { pagy: @pagy } %>
+        </nav>
+      <% end %>
     <% end %>
   </div>
 </div>