useSnapshot now memoizes the actions object so dependants don't see a
fresh reference on every render. ChatPage's mark-read effect keys off
activeSpaceId/latestActiveMessageId primitives instead of the snapshot
objects that re-allocate on reload, which prevents the markRead → reload
→ rerender loop that was deadlocking the Electron click path under
Playwright.
Also constrains HomePage agenda time to same-day activity so the
'Today' column doesn't surface a meaningless wall-clock for older tasks.
ZacharyZhang-NY
0eb1810246