fix: PDF-to-text duplicate .then() bug causing encrypted output + clean blog card gradients

fix: add ads.txt for AdSense authorisation

feat: add AdSense code (ca-pub-5242968615107720)

fix: GA4 measurement ID + fix await typo in video-to-gif

feat: replace English TTS with Kokoro neural voices (natural quality, distinct UK M/F)

fix: background remover (switch to transformers.js RMBG-1.4), fix TTS Spanish female voice matching

redeploy: restore site