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.

config/locales/views/account_sharings/en.yml

@@ -0,0 +1,29 @@
+---
+en:
+  account_sharings:
+    show:
+      title: Account Sharing
+      subtitle: Control who can see and interact with this account
+      member: Member
+      permission: Permission
+      shared: Shared
+      no_members: No other members in your %{moniker} to share with
+      permissions:
+        full_control: Full control
+        full_control_description: Can view, edit, and manage transactions
+        read_write: Can annotate
+        read_write_description: Can categorize, tag, and add notes
+        read_only: View only
+        read_only_description: Can only view account data
+      save: Save sharing settings
+      owner_label: "Owner: %{name}"
+      shared_with_count:
+        one: Shared with 1 member
+        other: "Shared with %{count} members"
+      include_in_finances: Include in my budgets & reports
+      exclude_from_finances: Exclude from my budgets & reports
+      finance_toggle_description: Count this account in your net worth, budgets, and reports
+    update:
+      success: Sharing settings updated
+      not_owner: Only the account owner can manage sharing
+      finance_toggle_success: Finance inclusion preference updated

config/locales/views/accounts/en.yml

@@ -1,6 +1,7 @@
 ---
 en:
   accounts:
+    not_authorized: "You don't have permission to manage this account"
     account:
       edit: Edit
       link_lunchflow: Link with Lunch Flow
@@ -13,6 +14,7 @@ en:
       remove_default: Unset default
       default_label: Default
       delete: Delete account
+      sharing: Sharing
     chart:
       data_not_available: Data not available for the selected period
     create:

config/locales/views/settings/en.yml

@@ -58,6 +58,11 @@ en:
         month_start_day: Budget month starts on
         month_start_day_hint: Set when your budget month starts (e.g., payday)
         month_start_day_warning: Your budgets and MTD calculations will use this custom start day instead of the 1st of each month.
+        sharing_title: "%{moniker} Sharing"
+        sharing_subtitle: "Control how accounts are shared in your %{moniker}"
+        sharing_default_label: Default sharing for new accounts
+        sharing_shared: Share with all members
+        sharing_private: Keep private by default
     profiles:
       destroy:
         cannot_remove_self: You cannot remove yourself from the account.

config/routes.rb

@@ -348,6 +348,8 @@ Rails.application.routes.draw do
     collection do
       post :sync_all
     end
+
+    resource :sharing, only: [ :show, :update ], controller: "account_sharings"
   end
 
   # Convenience routes for polymorphic paths