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

client/package.json

@@ -1,7 +1,7 @@
 {
   "name": "forge-client",
   "private": true,
-  "version": "2.3.1",
+  "version": "2.3.2",
   "type": "module",
   "scripts": {
     "dev": "vite",