Balance sheet cache layer, non-blocking sync UI (#2356)

* Balance sheet cache layer with cache-busting

* Update family cache timestamps during Sync

* Less blocking sync loaders

* Consolidate family data caching key logic

* Fix turbo stream broadcasts

* Remove dev delay

* Add back account group sorting

app/models/balance_sheet/account_group.rb

@@ -0,0 +1,61 @@
+class BalanceSheet::AccountGroup
+  include Monetizable
+
+  monetize :total, as: :total_money
+
+  attr_reader :name, :color, :accountable_type, :accounts
+
+  def initialize(name:, color:, accountable_type:, accounts:, classification_group:)
+    @name = name
+    @color = color
+    @accountable_type = accountable_type
+    @accounts = accounts
+    @classification_group = classification_group
+  end
+
+  # A stable DOM id for this group.
+  # Example outputs:
+  #   dom_id(tab: :asset)               # => "asset_depository"
+  #   dom_id(tab: :all, mobile: true)   # => "mobile_all_depository"
+  #
+  # Keeping all of the logic here means the view layer and broadcaster only
+  # need to ask the object for its DOM id instead of rebuilding string
+  # fragments in multiple places.
+  def dom_id(tab: nil, mobile: false)
+    parts = []
+    parts << "mobile" if mobile
+    parts << (tab ? tab.to_s : classification.to_s)
+    parts << key
+    parts.compact.join("_")
+  end
+
+  def key
+    accountable_type.to_s.underscore
+  end
+
+  def total
+    accounts.sum(&:converted_balance)
+  end
+
+  def weight
+    return 0 if classification_group.total.zero?
+
+    total / classification_group.total.to_d * 100
+  end
+
+  def syncing?
+    accounts.any?(&:syncing?)
+  end
+
+  # "asset" or "liability"
+  def classification
+    classification_group.classification
+  end
+
+  def currency
+    classification_group.currency
+  end
+
+  private
+    attr_reader :classification_group
+end