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/imports_controller.rb

@@ -8,7 +8,7 @@ class ImportsController < ApplicationController
     account_id = params.dig(:pdf_import, :account_id) || params.dig(:import, :account_id)
 
     if account_id.present?
-      account = Current.family.accounts.find_by(id: account_id)
+      account = accessible_accounts.find_by(id: account_id)
       unless account
         redirect_back_or_to import_path(@import), alert: t("imports.update.invalid_account", default: "Account not found.")
         return
@@ -67,7 +67,7 @@ class ImportsController < ApplicationController
     type = params.dig(:import, :type).to_s
     type = "TransactionImport" unless Import::TYPES.include?(type)
 
-    account = Current.family.accounts.find_by(id: params.dig(:import, :account_id))
+    account = accessible_accounts.find_by(id: params.dig(:import, :account_id))
     import = Current.family.imports.create!(
       type: type,
       account: account,