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 In doing so, some parts of the codebase have become outdated, unnecessary, or overly-complex as a natural result of this feature prioritization.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

@@ -1,22 +1,13 @@
 module Account::EntriesHelper
-  def permitted_entryable_partial_path(entry, relative_partial_path)
-    "account/entries/entryables/#{permitted_entryable_key(entry)}/#{relative_partial_path}"
-  end
-
-  def transfer_entries(entries)
-    transfers = entries.select { |e| e.transfer_id.present? }
-    transfers.map(&:transfer).uniq
-  end
-
-  def entries_by_date(entries, transfers: [], selectable: true, totals: false)
+  def entries_by_date(entries, totals: false)
     entries.group_by(&:date).map do |date, grouped_entries|
       content = capture do
-        yield [ grouped_entries, transfers.select { |t| t.outflow_transaction.entry.date == date } ]
+        yield grouped_entries
       end
 
       next if content.blank?
 
-      render partial: "account/entries/entry_group", locals: { date:, entries: grouped_entries, content:, selectable:, totals: }
+      render partial: "account/entries/entry_group", locals: { date:, entries: grouped_entries, content:, totals: }
     end.compact.join.html_safe
   end
 
@@ -28,11 +19,4 @@ module Account::EntriesHelper
       entry.display_name
     ].join(" • ")
   end
-
-  private
-
-    def permitted_entryable_key(entry)
-      permitted_entryable_paths = %w[transaction valuation trade]
-      entry.entryable_name_short.presence_in(permitted_entryable_paths)
-    end
 end

app/helpers/account/holdings_helper.rb

@@ -1,13 +0,0 @@
-module Account::HoldingsHelper
-  def brokerage_cash_holding(account)
-    currency = Money::Currency.new(account.currency)
-
-    account.holdings.build \
-      date: Date.current,
-      qty: account.cash_balance,
-      price: 1,
-      amount: account.cash_balance,
-      currency: currency.iso_code,
-      security: Security.new(ticker: currency.iso_code, name: currency.name)
-  end
-end