Show one row per recurring chore in the flat task list

The recurrence scheduler materializes a series' next instance once the
current one comes due, regardless of whether it was completed -- that's
deliberate, so ignoring an occurrence doesn't stall the series. The side
effect is that the flat task list shows an unfinished chore and its
already-generated successor at the same time: "Bills" appears twice right
now (Sep 1 overdue + Oct 1), as does "Bones's meds".

CollapseRecurringSeries keeps only the earliest-due open instance per
series, which is the one actually owed. Applied to the atoms list only --
the timeline and widget are date-anchored, where each instance correctly
belongs to its own day, so they keep all of them.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018AwnALZL6bD4VBtATDVv3B

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