Use new balance components in activity feed (#2511)

* Balance reconcilations with new components

* Fix materializer and test assumptions

* Fix investment valuation calculations and recon display

* Lint fixes

* Balance series uses new component fields

app/models/balance.rb

@@ -14,4 +14,18 @@ class Balance < ApplicationRecord
 
   scope :in_period, ->(period) { period.nil? ? all : where(date: period.date_range) }
   scope :chronological, -> { order(:date) }
+
+  def balance_trend
+    Trend.new(
+      current: end_balance_money,
+      previous: start_balance_money,
+      favorable_direction: favorable_direction
+    )
+  end
+
+  private
+
+    def favorable_direction
+      flows_factor == -1 ? "down" : "up"
+    end
 end