[OU-FIX] loyalty: pre-migrate stale `_get_mail_partner` in stored mail.template.lang#78

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dnplkndll wants to merge 3 commits into

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19.0-mig-loyalty-pre-migration

Commits on Jun 19, 2026

[OU-FIX] loyalty: pre-migrate stale `_get_mail_partner` in stored mail.template.lang
dnplkndll
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[FIX] loyalty: rewrite _get_mail_partner to its real 18.0 equivalent
dnplkndll
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[FIX] loyalty: cast the body_html rewrite back to jsonb
dnplkndll
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