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>

server.js

@@ -10,7 +10,7 @@ import { router as iconsRouter } from './lib/api/routes/icons.js';
 import { startCron } from './lib/cron/index.js';
 import { seedFromConfig } from './lib/health/registry.js';
 
-const VERSION = '2.0.0-alpha.11';
+const VERSION = '2.0.0-alpha.12';
 
 export function createApp() {
   const app = express();