[dorianvp]

Wall clock and mixnet journal reads in render go through useSyncExternalStore stores, so the React Compiler's memo caches invalidate when they change and the frozen relative times, the swap delete button and the Doctor's journal repaint.

Closes #1889

[github-actions]

Visual review — ✅ matches baseline

Head vs visual/__baseline__. Open the review page — Current, Animations, and Image diffs tabs.

[juanky201271]

Fixes all five cases in #1889. Three small things:

1. clock.ts can lag real time by up to ~2 min: the value is floored to the minute and the 60 s interval isn't aligned to the minute boundary. SyncLine had 30 s precision before; now "just now" can last ~3 min, and falling-behind / the 30 min deposit warning come up to 2 min late. Checking every 10–15 s while still notifying only on a minute change fixes it.
2. bucket only moves in strike, so after a stretch with no readers the first one reads a stale minute for up to 60 s. Recompute it in subscribe when the first listener joins.
3. Add Closes #1889 so the issue closes on merge.