Start and end balance breakdown in activity view (#2466)

* Initial data objects

* Remove trend calculator

* Fill in balance reconciliation for entry group

* Initial tooltip component

* Balance trends in activity view

* Lint fixes

* trade partial alignment fix

* Tweaks to balance calculation to acknowledge holdings value better

* More lint fixes

* Bump brakeman dep

* Test fixes

* Remove unused class

app/models/balance/trend_calculator.rb

@@ -1,30 +0,0 @@
-# The current system calculates a single, end-of-day balance every day for each account for simplicity.
-# In most cases, this is sufficient.  However, for the "Activity View", we need to show intraday balances
-# to show users how each entry affects their balances.  This class calculates intraday balances by
-# interpolating between end-of-day balances.
-class Balance::TrendCalculator
-  BalanceTrend = Struct.new(:trend, :cash, keyword_init: true)
-
-  def initialize(balances)
-    @balances = balances
-  end
-
-  def trend_for(date)
-    balance = @balances.find { |b| b.date == date }
-    prior_balance = @balances.find { |b| b.date == date - 1.day }
-
-    return BalanceTrend.new(trend: nil) unless balance.present?
-
-    BalanceTrend.new(
-      trend: Trend.new(
-        current: Money.new(balance.balance, balance.currency),
-        previous: prior_balance.present? ? Money.new(prior_balance.balance, balance.currency) : nil,
-        favorable_direction: balance.account.favorable_direction
-      ),
-      cash: Money.new(balance.cash_balance, balance.currency),
-    )
-  end
-
-  private
-    attr_reader :balances
-end