v0.77.3

Fixed

• Split expenses: adding a family member as a group guest restricted their navigation to the Split page only: when an existing user was added to an expense group with the guest role via the members endpoint, they were incorrectly written into the split_expense_guest_users table. This caused access_scope to be resolved as split_guest on their next login, hiding all navigation items except Budget/Split. The split_expense_guest_users table is now exclusively populated by the dedicated guest-account creation flow. A database migration removes existing incorrect entries for users who have no guest_created activity record. (Fixes #400)