New Design System + Codebase Refresh (#1823)

Since the very first 0.1.0-alpha.1 release, we've been moving quickly to add new features to the Maybe app. In doing so, some parts of the codebase have become outdated, unnecessary, or overly-complex as a natural result of this feature prioritization.

Now that "core" Maybe is complete, we're moving into a second phase of development where we'll be working hard to improve the accuracy of existing features and build additional features on top of "core". This PR is a quick overhaul of the existing codebase aimed to:

- Establish the brand new and simplified dashboard view (pictured above)
- Establish and move towards the conventions introduced in Cursor rules and project design overview #1788
- Consolidate layouts and improve the performance of layout queries
- Organize the core models of the Maybe domain (i.e. Account::Entry, Account::Transaction, etc.) and break out specific traits of each model into dedicated concerns for better readability
- Remove stale / dead code from codebase
- Remove overly complex code paths in favor of simpler ones

app/views/import/cleans/show.html.erb

@@ -43,7 +43,7 @@
         <% end %>
       </div>
 
-      <div class="bg-white border border-secondary rounded-xl shadow-xs divide-y divide-alpha-black-200">
+      <div class="bg-white shadow-border-xs rounded-xl divide-y divide-alpha-black-200">
         <% @rows.each do |row| %>
           <%= render "import/rows/form", row: row %>
         <% end %>
@@ -52,8 +52,8 @@
   </div>
 
   <div class="fixed bottom-0 left-1/2 -translate-x-1/2 w-full p-12">
-    <div class="border border-tertiary rounded-lg p-3 max-w-2xl mx-auto bg-white shadow-xs">
-      <%= render "application/pagination", pagy: @pagy %>
+    <div class="shadow-border-xs rounded-lg p-3 max-w-2xl mx-auto bg-white">
+      <%= render "shared/pagination", pagy: @pagy %>
     </div>
   </div>
 </div>