- Derive task elapsed time from columnMovedAt with updatedAt/createdAt fallbacks and guard against invalid or future timestamps
- Render a clock-based timer chip on in-progress and done cards with accessible labeling and tooltip metadata
- Add TaskCard styles for the timer row/chip using design tokens, including mobile-size adjustments
- Expand TaskCard tests to cover visibility by column, invalid timestamp suppression, boundary label formatting, and 30s live refresh cadence
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