1f46a241d2
PR #646's review-round renumbered its slideshow migrations to 138 + 139 to slot in after PR #649's 137 (whatsapp_template_language). That now collides with this PR's 138. Slide ours to 140 so all three land in strict order: #649 (137) → #646 (138, 139) → this PR (140). Content unchanged; pure rename + a one-line docstring tweak noting the slot.