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* fix: share family accounts with invited members on every sign-up path A user who joined an existing family through an invitation was added to the family but saw none of its accounts, even when the family's default sharing is "share with all members". Only Invitation#accept_for created the AccountShare records; the OIDC just-in-time sign-up, invite-token registration, and mobile SSO onboarding paths all skipped it, so invitees landed in the family with an empty account list. Signups routed into an invite-only default family had the same gap. Extract the sharing into Family#auto_share_existing_accounts_with, the single entry point for "a member just joined, apply the family's sharing policy". It honors default_account_sharing, only shares with a persisted member of the family, grants read_only to guests and read_write to everyone else, excludes accounts the user already owns, and is idempotent. accept_for and every sign-up path call it, so no current or future join path can reintroduce the empty-account bug or share accounts across families. Also wrap the two SSO account-creation paths (OIDC JIT and mobile SSO) in a transaction covering the user save, invitation acceptance, account sharing, and identity creation, so a failure partway through can no longer leave a half-onboarded user with no linked identity. * address review: guest read_only symmetric in auto_share_with_family!, load-bearing guard comment, mobile SSO private-no-op test