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Portrait entries (first image taller than wide) get a 4:5 container — Instagram's proven cap that prevents single photos dominating the screen. Landscape entries keep 4:3. Aspect-ratio moved from slide to wrap so the strip inherits it via height:100%. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Vgmzx8VTTTmCskSpQtsLTr