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Root cause: The .app-layout.detail-closed class (2-class specificity) was overriding .app-layout (1-class specificity) at mobile, creating a 3-column grid "0 1fr 0" instead of single column "1fr". The task-pane was placed in column 1 (0 width), making it invisible. Fix: Explicitly override both .app-layout and .app-layout.detail-closed with equal specificity in the 768px breakpoint. Cache bust: v=6 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>