feat(insights): full-width category items with more space

Inside "Alert categories" and "Watch list", the category cards are now a
full-width single-column stack instead of a narrow multi-column grid, with
more breathing room (larger gap, roomier headers + ticket rows, taller
expanded list). Each card was already a click-to-expand accordion and
remains so — CSS-only, index.tsx unchanged. The section-level collapse from
2.3.1 still works (.grid[hidden] preserved).

- Insights.module.scss: .grid grid -> flex column (gap 16); cardHead
  padding 16/20; cardTitle 14px; row padding 8/20; list max-height 440
- bump 2.3.1 -> 2.3.2 (root + client), CHANGELOG [2.3.2]
- engineer artifact + INDEX; verifier-log PASS entry

verifier PASS: reproduced tsc + vite build + npm test 9/9; confirmed
flex-column + .grid[hidden] collapse in compiled CSS; no row-grid
regression; no new dependency.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VEsaHQx8cXr1hFrKU42UK6

claude_artifacts/INDEX.md

@@ -1,4 +1,5 @@
 # Artifact index
+- [engineer-20260829-122201](engineer-20260829-122201.md) — PM Insights: category items in "Alert categories" + "Watch list" now full-width single-column accordions with more space (grid→flex column, roomier card/row padding). CSS-only. v2.3.2. verifier PASS.
 - [engineer-20260829-120746](engineer-20260829-120746.md) — PM Insights: "Alert categories" + "Watch list" now collapsible accordions (new `Section`, `ChevronIcon`, `.grid[hidden]` collapse, `aria-expanded`/`aria-controls`). v2.3.1. verifier PASS.
 - [engineer-20260827-190753](engineer-20260827-190753.md) — Jira statusDurations+movements + chart #17 (Active tab), /api/analytics/jira-durations, seed-enriched from board_state. v2.3.0.
 - [engineer-20260827-185932](engineer-20260827-185932.md) — Extension Jira sync (SNOW→Jira, attach-only /api/sync/jira, custom-domain + PAT). v2.2.0. Live-verified attach-only.