feat(ui): 2.0.0-alpha.12 — editable Sacred Valley layout

Edit-layout mode: per-card resize (S/M/L), show/hide with a hidden-cards tray,
drag-to-reorder via a dedicated grip handle, and reset-to-default. Persists via
the existing /api/dashboard/layout (order/sizes/hidden) — no backend change.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "void-server",
-  "version": "2.0.0-alpha.11",
+  "version": "2.0.0-alpha.12",
   "type": "module",
   "private": true,
   "scripts": {