New trilingual /<lang>/become-a-member/ conversion page: hero with real-photo collage, why-join benefits, animated MSOS-in-numbers, ways to participate, membership-in-real-life and projects showcase (real project photos), testimonials, who-can-join, an adaptive multi-step form (student + supporter flows, conditional fields, progress, personalised messages, validation, success screen), FAQ and final CTA. Site-wide 'Become a member' buttons now link here. Form posts to a Google Form once wired; metrics/testimonials are placeholders to confirm.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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