Three CSV / QIF account selects in import/uploads/show.html.erb and one
PDF-import account select in imports/_pdf_import.html.erb pulled their
options from `@import.family.accounts`. That listed every account in
the family — including the family admin's unshared personal accounts —
in the dropdown shown to any member running an import. Swap each call
site to `Current.user.accessible_accounts` (owned + explicitly shared
accounts only), matching the existing scoping used by the dashboard
sidebar, transactions controller, transfers controller, etc.
Adds a regression test that signs in as family_member and asserts the
unshared-account names from the dylan_family fixtures never appear in
the rendered upload page.
e4e64ec82f