inviteTitular alreadyExisted branch asserts a successful welcome-email send regardless of emailSent

SHIPPED UI COPY ASSERTING A SUCCESSFUL SEND ON A FAILED ONE. admin-actions.ts:1633 -- inviteTitular's alreadyExisted branch returns '...y se le envio el correo de bienvenida' REGARDLESS of emailSent. A section-No-Silent-Failures violation LIVE IN PRODUCTION. Found by coder-venus-cc while reading for VENUS-333; AUTHORIZED SEPARATELY by pmmaster (ms83k1c601z3) and explicitly NOT held behind the Lorena role decision -- it is independent of any one person and should not wait on a question about one. Its own change, its own SHA, normal lane. TIER: non-Class-A on the diff as described (copy + a conditional), BUT IT SITS ON THE EMAIL-SEND PATH -- coder's call at push time; IF THE FIX TOUCHES SEND-RESULT HANDLING RATHER THAN ONLY THE STRING, TREAT IT CLASS-A and take the pre-push audit ping. Related but separate defect on the same function, do NOT fix under this WI without saying so: inviteTitular's INSERT ... WHERE NOT EXISTS (userId=$1 AND deletedAt IS NULL) means running it against a user who already holds a live role RETURNS SUCCESS, SENDS THE MAIL, AND GRANTS NOTHING -- success return, zero effect, user mailed. Owner coder-venus-cc.