Family sharing (#1272)

* Initial account sharing changes

* Update schema.rb

* Update schema.rb

* Change sharing UI to modal

* UX fixes and sharing controls

* Scope include in finances better

* Update totals.rb

* Update totals.rb

* Scope reports to finance account scope

* Update impersonation_sessions_controller_test.rb

* Review fixes

* Update schema.rb

* Update show.html.erb

* FIX db validation

* Refine edit permissions

* Review items

* Review

* Review

* Add application level helper

* Critical review

* Address remaining review items

* Fix modals

* more scoping

* linter

* small UI fix

* Fix: Sync broadcasts push unscoped balance sheet to all users

* Update sync_complete_event.rb

 The fix removes the sidebar broadcasts (which rendered unscoped account groups using family.balance_sheet without user context)
  along with the now-unused sidebar_targets, account_group, and family_balance_sheet private methods.

  The sidebar will still update correctly — when the sync completes, Family::SyncCompleteEvent#broadcast fires family.broadcast_refresh, which triggers a
  morph-based page refresh for each user with their own authenticated session, rendering properly scoped sidebar content.

app/controllers/import/uploads_controller.rb

@@ -19,7 +19,7 @@ class Import::UploadsController < ApplicationController
     elsif @import.is_a?(SureImport)
       update_sure_import_upload
     elsif csv_valid?(csv_str)
-      @import.account = Current.family.accounts.find_by(id: import_account_id)
+      @import.account = accessible_accounts.find_by(id: import_account_id)
       @import.assign_attributes(raw_file_str: csv_str, col_sep: upload_params[:col_sep])
       @import.save!(validate: false)
 
@@ -78,7 +78,7 @@ class Import::UploadsController < ApplicationController
       end
 
       ActiveRecord::Base.transaction do
-        @import.account = Current.family.accounts.find(import_account_id)
+        @import.account = accessible_accounts.find(import_account_id)
         @import.raw_file_str = QifParser.normalize_encoding(csv_str)
         @import.save!(validate: false)
         @import.generate_rows_from_csv