feat(next-up): show the next three deadlines, not one

A reader with two games switched on said the list lost its point at
twenty-one rows and asked for the three closest deadlines up front. One row
was also fragile on its own terms: ticking off the headline event left the
panel pointing at something the reader had no context for.

Three equal panels would be a stat grid, and a reader arrives with one
question — so the shape is one answer at full size and two follow-ups under
it, with no meter, summary or badges to turn the panel into a second copy of
the list below it.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>

docs/ARCHITECTURE.md

@@ -96,7 +96,7 @@ src/
     sw.js               offline: shell cache, feed fallback
     manifest.webmanifest, icon.svg
     components/
-      NextUp.tsx        the hero countdown          (PRD F1)
+      NextUp.tsx        the next three deadlines    (PRD F2)
       EventRow.tsx      row + meter + caption       (F2, F3)
       Meter.tsx         the depletion meter
       Legend.tsx        what the bars and colours mean

docs/FEEDBACK.md

@@ -301,7 +301,7 @@ diagnosis in each item still holds — what changed is whether it has been acted
 |---|---|
 | P0 refresh pipeline | **Diagnosed, half acted on.** game8.co answers a GitHub Actions runner with `202` and a bot-management body, so those eight sources have only ever built from fixtures in CI — see `AGENTS.md` § Scraping conduct, including why it is not to be worked around. The `broken` tier now makes a source failing three cycles fail the run. Step 5 (a build assertion on snapshot age) is **not built** |
 | P1a Arknights | **Done.** `arknights-akwiki-events`, via the new `akwiki` parser |
-| P1b `NextUp` → three | **Not done.** Still one row |
+| P1b `NextUp` → three | **Done** (2026-08-18). One headline and two behind it, off `nextToExpire` |
 | P1b cap the long list | **Not done.** No "show all N" expander |
 | P1b persist `view` | **Not done.** Still `useState` in `App.tsx` |
 | P1b Calendar → Timeline | **Done.** The tab reads "Timeline" |