List open online activities that are already under way

[bernardhanna]

Summary

• Gate the featured activities list on end_date alone, so activities that began earlier but have not finished are included
• Group an activity that has already begun under the current month rather than the month it started in
• Sort by that same effective start, so a long-running activity does not jump to the top of the list with an old date

Why

The month filter stopped at November 2026, which was correct: production has exactly one open-online activity starting in November and none after it.

Open-online, approved	Count
Starting on/after 1 Sep 2026	218
Starting on/after 1 Nov 2026	1
Starting on/after 1 Dec 2026	0

Looking into it surfaced a real gap. baseQuery() required start_date >= firstOfMonth(), so any activity already under way was excluded even though the page describes itself as listing activities that welcome participants. Two open-online activities are currently in that position:

• Target the Cube — 10 Oct 2021 to 31 Oct 2027
• "How much water do robots drink?" project team members — 14 Feb 2026 to 14 Feb 2027

Grouping them by their real start month would have added stray past months to the filter, so effectiveStart() clamps an already-started activity to the current month.

Test plan

• php artisan test tests/Feature/OnlineEventsWorkflowTest.php — 15 passed
• New test: an activity running from 4 months ago to 6 months ahead is listed; one that ended last month is not
• New test: that activity appears under the current month, and its original month is not offered in the filter
• Verified against a local render — count rose by one and the filter gained the current month, not the start month
• On deploy, confirm the "Showing X of Y" total rises modestly (a large jump would suggest activities with bad end dates)

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