applySnapshot checked serverElapsed > 0 before setting blockStartedAt,
so any block with 0 elapsed (just reset, or started within the same
second) was loaded with blockStartedAt = null — the timer appeared frozen.
The condition now only checks for a current_block_id; the isPaused flag
already handles the "selected but not started" case correctly.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>