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/e2e/resources.spec.ts

@@ -3,7 +3,7 @@ import { expect, test } from "@playwright/test";
 test.describe("Resources", () => {
   test.beforeEach(async ({ page }) => {
     await page.goto("/auth/signin");
-    await page.fill('input[type="email"]', "manager@capakraken.dev");
+    await page.fill('input[type="email"]', "manager@nexus.dev");
     await page.fill('input[type="password"]', "manager123");
     await page.click('button[type="submit"]');
     await expect(page).toHaveURL(/\/(dashboard|resources)/);
@@ -21,10 +21,11 @@ test.describe("Resources", () => {
     await expect(rows.first()).toBeVisible();
 
     const firstRowText = (await rows.first().textContent()) ?? "";
-    const searchTerm = firstRowText
-      .split(/\s+/)
-      .map((token) => token.replace(/[^A-Za-z0-9@._-]/g, "").trim())
-      .find((token) => token.length >= 3) ?? "EMP";
+    const searchTerm =
+      firstRowText
+        .split(/\s+/)
+        .map((token) => token.replace(/[^A-Za-z0-9@._-]/g, "").trim())
+        .find((token) => token.length >= 3) ?? "EMP";
 
     const searchInput = page.locator('input[type="search"]');
     await searchInput.fill(searchTerm);