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First real screen replacing the scaffold: LargeTopAppBar, smart-list cards in a 2x2 grid with correct tonal pairings (Today=primary, Overdue=error, Upcoming=tertiary, All=secondary containers), user lists grouped by account with colour dots + open counts, and an Extended FAB. Consumes the live ListsViewModel; navigation callbacks stubbed for the next screens. Verified on device against real tasks.org/DAVx5 data. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>