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 In doing so, some parts of the codebase have become outdated, unnecessary, or overly-complex as a natural result of this feature prioritization.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

@@ -16,7 +16,7 @@ class Account::TransactionSearch
 
   # Returns array of Account::Entry objects to stay consistent with partials, which only deal with Account::Entry
   def build_query(scope)
-    query = scope
+    query = scope.joins(entry: :account)
 
     if types.present? && types.exclude?("transfer")
       query = query.joins("LEFT JOIN transfers ON transfers.inflow_transaction_id = account_entries.id OR transfers.outflow_transaction_id = account_entries.id")
@@ -40,8 +40,13 @@ class Account::TransactionSearch
 
     query = query.joins(:tags).where(tags: { name: tags }) if tags.present?
 
-    entries_scope = Account::Entry.account_transactions.where(entryable_id: query.select(:id))
+    # Apply common entry search filters
+    query = Account::EntrySearch.apply_search_filter(query, search)
+    query = Account::EntrySearch.apply_date_filters(query, start_date, end_date)
+    query = Account::EntrySearch.apply_type_filter(query, types)
+    query = Account::EntrySearch.apply_amount_filter(query, amount, amount_operator)
+    query = Account::EntrySearch.apply_accounts_filter(query, accounts, account_ids)
 
-    Account::EntrySearch.from_entryable_search(self).build_query(entries_scope)
+    query
   end
 end