Fix SchleuderResend script after conversion to WebExtension API#3

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doobry-systemli wants to merge 2 commits intojobisoft:mainfrom

doobry-systemli:fix/schleuder_resend

Commits on Aug 3, 2025

fix(SchleuderResend): Fix parsing body of compose message
doobry-systemli
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fix(SchleuderResend): Always return a 'X-RESEND' pseudo header
doobry-systemli
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