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 In doing so, some parts of the codebase have become outdated, unnecessary, or overly-complex as a natural result of this feature prioritization.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

test/controllers/account/transactions_controller_test.rb

@@ -74,7 +74,7 @@ class Account::TransactionsControllerTest < ActionDispatch::IntegrationTest
   end
 
   test "can destroy many transactions at once" do
-    transactions = @user.family.entries.incomes_and_expenses
+    transactions = @user.family.entries.account_transactions
     delete_count = transactions.size
 
     assert_difference([ "Account::Transaction.count", "Account::Entry.count" ], -delete_count) do

test/controllers/accounts_controller_test.rb

@@ -6,19 +6,6 @@ class AccountsControllerTest < ActionDispatch::IntegrationTest
     @account = accounts(:depository)
   end
 
-  test "gets accounts list" do
-    get accounts_url
-    assert_response :success
-
-    @user.family.accounts.manual.each do |account|
-      assert_dom "#" + dom_id(account), count: 1
-    end
-
-    @user.family.plaid_items.each do |item|
-      assert_dom "#" + dom_id(item), count: 1
-    end
-  end
-
   test "new" do
     get new_account_path
     assert_response :ok

test/controllers/issues_controller_test.rb

@@ -8,6 +8,7 @@ class IssuesControllerTest < ActionDispatch::IntegrationTest
   test "should get show polymorphically" do
     issues.each do |issue|
       get issue_url(issue)
+
       assert_response :success
       assert_dom "h2", text: issue.title
       assert_dom "h3", text: "Issue Description"