rename(phase 1): CapaKraken → Nexus across code, UI, docs, CI

- @capakraken/* → @nexus/* across 12 packages (root + 11 workspaces),
  1551 import lines migrated via codemod
- User-visible brand strings renamed (emails, page titles, PWA
  manifest, mobile header, MFA backup-codes header, tooltips, signin
  page, invite page, weekly digest, install prompt)
- TOTP issuer "CapaKraken" → "Nexus" (existing secrets still valid;
  re-enrollment relabels them in users' authenticator apps)
- Function rename: assertCapaKrakenDbTarget → assertNexusDbTarget
- LocalStorage migration shim in apps/web/src/app/layout.tsx copies
  capakraken_* → nexus_* on first load (guarded by nexus_migrated_v1
  sentinel; runs once per browser, then never again)
- Service-worker cache name capakraken-v2 → nexus-v2 with one-time
  caches.delete('capakraken-v2') from the same shim
- Email-domain fixtures @capakraken.{dev,app} → @nexus.{dev,app} in
  seed data, e2e specs, SMTP default fallback
- Dockerfile.dev / Dockerfile.prod / all .github/workflows/*.yml
  pnpm --filter @capakraken/* → @nexus/*
- README, CLAUDE.md, LEARNINGS.md, all docs/*.md, .env.example,
  tooling/deploy/.env.production.example brand sweep

Phase 1 deliberately leaves untouched (handled in Phase 3 cutover):
- PostgreSQL DB name "capakraken" and POSTGRES_USER "capakraken"
- Volume names capakraken_pgdata etc.
- Compose project name "capakraken" / "capakraken-prod"
- db-target-guard default expectedDatabase
- env-var CAPAKRAKEN_EXPECTED_DB_NAME
- Container DNS names in docker-compose.ci.yml

Quality gates green: pnpm typecheck (7/7), pnpm test:unit (7/7),
pnpm lint (0 errors), check:exports/imports/architecture all pass.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

apps/web/src/components/dashboard/DashboardClient.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import type { DashboardWidgetConfig, DashboardWidgetType } from "@capakraken/shared/types";
+import type { DashboardWidgetConfig, DashboardWidgetType } from "@nexus/shared/types";
 import { verticalCompactor, horizontalCompactor, type Compactor } from "react-grid-layout";
 
 // Runs vertical compaction first (float up), then horizontal (float left).
@@ -152,13 +152,25 @@ function DeferredWidgetBody({
     };
   }, [activationRank, isActive, isPriority]);
 
-  return <div ref={containerRef} className="h-full">{isActive ? renderWidget(type, config, onConfigChange) : <DeferredWidgetFallback />}</div>;
+  return (
+    <div ref={containerRef} className="h-full">
+      {isActive ? renderWidget(type, config, onConfigChange) : <DeferredWidgetFallback />}
+    </div>
+  );
 }
 
 export function DashboardClient() {
   const [addModalOpen, setAddModalOpen] = useState(false);
-  const { config, isHydrated, saveStatus, addWidget, removeWidget, updateWidgetConfig, onLayoutChange, resetLayout } =
-    useDashboardLayout();
+  const {
+    config,
+    isHydrated,
+    saveStatus,
+    addWidget,
+    removeWidget,
+    updateWidgetConfig,
+    onLayoutChange,
+    resetLayout,
+  } = useDashboardLayout();
 
   // Measure grid container width so Responsive knows the column size.
   // We can't use WidthProvider (uses findDOMNode, deprecated in React 18).