Previously, clicking a different block always fired 'start' which reset
elapsed to zero — returning to a block lost all accumulated time.
Store changes:
- Add blockElapsedCache (blockId → elapsed seconds) that persists across
block switches within a session
- On 'pause' WS event: write the block's total elapsed into the cache
- On 'start' WS event: restore elapsed from cache (0 if never worked)
- On applySnapshot: seed cache with server-computed elapsed for the
current block (so reloading preserves state correctly)
- Clear cache when the session ends
Dashboard selectBlock changes:
- Auto-pause the currently running block before switching to another
- Clicking the active block while paused now sends 'resume' instead of
doing nothing
- Clicking the already-running active block is a no-op
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
derekc
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