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Problem: .master-list had hardcoded height: calc(100vh - 210px), causing scroll on first load Changes: • .master-list: calc(100vh - 210px) → flex: 1; min-height: 0; • .items: Added missing min-height: 0; (required for flex children) Result: Single-screen principle restored (no page-level scroll, height fills viewport) This aligns with AGENTS.md Height Propagation Chain standard. Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>