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/account/chartable.rb

@@ -24,20 +24,10 @@ module Account::Chartable
   end
 
   def sparkline_series
-    cache_key = family.build_cache_key("#{id}_sparkline")
+    cache_key = family.build_cache_key("#{id}_sparkline", invalidate_on_data_updates: true)
 
-    Rails.cache.fetch(cache_key) do
+    Rails.cache.fetch(cache_key, expires_in: 24.hours) do
       balance_series
     end
-  rescue => e
-    Rails.logger.error "Sparkline series error for account #{id}: #{e.message}"
-    # Return empty series as fallback
-    Series.new(
-      start_date: 30.days.ago.to_date,
-      end_date: Date.current,
-      interval: "1 day",
-      values: [],
-      favorable_direction: favorable_direction
-    )
   end
 end

app/models/account/sync_complete_event.rb

@@ -16,13 +16,13 @@ class Account::SyncCompleteEvent
       locals: { account: account }
     )
 
-    # Replace the groups this account belongs to in the sidebar
-    account_group_ids.each do |id|
+    # Replace the groups this account belongs to in both desktop and mobile sidebars
+    sidebar_targets.each do |(tab, mobile_flag)|
       account.broadcast_replace_to(
         account.family,
-        target: id,
+        target: account_group.dom_id(tab: tab, mobile: mobile_flag),
         partial: "accounts/accountable_group",
-        locals: { account_group: account_group, open: true }
+        locals: { account_group: account_group, open: true, all_tab: tab == :all, mobile: mobile_flag }
       )
     end
 
@@ -37,18 +37,18 @@ class Account::SyncCompleteEvent
   end
 
   private
-    # The sidebar will show the account in both its classification tab and the "all" tab,
-    # so we need to broadcast to both.
-    def account_group_ids
-      unless account_group.present?
-        error = Error.new("Account #{account.id} is not part of an account group")
-        Rails.logger.warn(error.message)
-        Sentry.capture_exception(error, level: :warning)
-        return []
-      end
+    # Returns an array of [tab, mobile?] tuples that should receive an update.
+    # We broadcast to both the classification-specific tab and the "all" tab,
+    # for desktop (mobile: false) and mobile (mobile: true) variants.
+    def sidebar_targets
+      return [] unless account_group.present?
 
-      id = account_group.id
-      [ id, "#{account_group.classification}_#{id}" ]
+      [
+        [ account_group.classification.to_sym, false ],
+        [ :all, false ],
+        [ account_group.classification.to_sym, true ],
+        [ :all, true ]
+      ]
     end
 
     def account_group