Canonicalise a rich-card CTA action string to the exact value WhatsApp's renderer
expects. Maps the common open-a-link aliases (open_url, openUrl, url, link,
open_link, any case/spacing) to OPEN_URL; otherwise trims + upper-cases the value
through unchanged. No-op for already-correct input. Used by addCompact/addProfileCard/addFooterAction.
Canonicalise a rich-card CTA action string to the exact value WhatsApp's renderer expects. Maps the common open-a-link aliases (
open_url,openUrl,url,link,open_link, any case/spacing) toOPEN_URL; otherwise trims + upper-cases the value through unchanged. No-op for already-correct input. Used by addCompact/addProfileCard/addFooterAction.