Plaid portfolio sync algorithm and calculation improvements (#1526)

* Start tests rework

* Cash balance on schema

* Add reverse syncer

* Reverse balance sync with holdings

* Reverse holdings sync

* Reverse holdings sync should work with only trade entries

* Consolidate brokerage cash

* Add forward sync option

* Update new balance info after syncs

* Intraday balance calculator and sync fixes

* Show only balance for trade entries

* Tests passing

* Update Gemfile.lock

* Cleanup, performance improvements

* Remove account reloads for reliable sync outputs

* Simplify valuation view logic

* Special handling for Plaid cash holding

app/helpers/languages_helper.rb

@@ -363,4 +363,8 @@ module LanguagesHelper
       end
       .sort_by { |label, locale| label }
   end
+
+  def timezone_options
+    ActiveSupport::TimeZone.all.map { |tz| [ tz.name + " (#{tz.tzinfo.identifier})", tz.tzinfo.identifier ] }
+  end
 end