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* fix(family-sharing): prevent silent data loss when rehoming or removing users Fixes #1689. Two destructive paths could strand a pre-existing user's family and accounts: 1. Invitation#accept_for unconditionally overwrote user.family_id, orphaning the prior family + its accounts with no user able to reach them. 2. Settings::ProfilesController#destroy then called @user.destroy when an admin removed the rehomed member, destroying the only login path back to the now-orphaned data. Add hard-block guards on both paths. accept_for refuses when the invitee already belongs to a family with accounts; ProfilesController#destroy refuses when the member owns accounts in another family (legacy state from the old flow). InvitationsController#create surfaces a specific, actionable flash so the admin understands why the auto-accept was refused. No automatic recovery of already-orphaned data — that needs a separate one-shot script per dosubot's analysis on the issue. * fix(family-sharing): scope invite orphan-guard to invitee-owned accounts (#1896 review) Codex flagged (P1) and the maintainer review independently raised that would_orphan_existing_family? keyed off user.family.accounts.exists? — any account in the invitee's current family — which wrongly blocked a non-owner member from leaving a multi-user household. Rename to would_orphan_owned_accounts? and key off user.owned_accounts.where.not(family_id: family_id), making the invite guard symmetric with the destroy-path guard in Settings::ProfilesController. A member who owns no accounts now orphans nothing by moving and is free to accept the invitation; an owner is still blocked. Add a regression test for the non-owner case and update the existing tests to give the invitee explicit account ownership. * Remove extra comments per project conventions --------- Co-authored-by: Juan José Mata <jjmata@jjmata.com>