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>

packages/application/src/use-cases/allocation/create-assignment.ts

@@ -1,10 +1,10 @@
-import { calculateAllocation, validateAvailability, checkDuplicateAssignment } from "@capakraken/engine";
-import type { PrismaClient, Prisma } from "@capakraken/db";
+import { calculateAllocation, validateAvailability, checkDuplicateAssignment } from "@nexus/engine";
+import type { PrismaClient, Prisma } from "@nexus/db";
 import {
   type Allocation,
   type CreateAssignmentInput,
   type WeekdayAvailability,
-} from "@capakraken/shared";
+} from "@nexus/shared";
 import { TRPCError } from "@trpc/server";
 import { listAssignmentBookings } from "./list-assignment-bookings.js";
 
@@ -110,7 +110,7 @@ export async function createAssignment(
     input.projectId,
     input.startDate,
     input.endDate,
-    existingBookings.map(b => ({
+    existingBookings.map((b) => ({
       id: b.id,
       resourceId: b.resourceId ?? "",
       projectId: b.projectId,
@@ -123,7 +123,9 @@ export async function createAssignment(
   if (duplicateResult.isDuplicate) {
     throw new TRPCError({
       code: "CONFLICT",
-      message: duplicateResult.message ?? "Resource is already assigned to this project with overlapping dates",
+      message:
+        duplicateResult.message ??
+        "Resource is already assigned to this project with overlapping dates",
     });
   }
 
@@ -230,8 +232,8 @@ export async function createAssignmentFragment(
       role: input.role ?? null,
       roleId: input.roleId ?? null,
       dailyCostCents: input.dailyCostCents,
-      status: input.status as import("@capakraken/db").AllocationStatus,
-      metadata: input.metadata as import("@capakraken/db").Prisma.InputJsonValue,
+      status: input.status as import("@nexus/db").AllocationStatus,
+      metadata: input.metadata as import("@nexus/db").Prisma.InputJsonValue,
     },
     include: ASSIGNMENT_RELATIONS_INCLUDE,
   });
@@ -241,7 +243,7 @@ export async function createAssignmentFragment(
       entityType: "Assignment",
       entityId: assignment.id,
       action: "CREATE",
-      changes: { after: assignment } as unknown as import("@capakraken/db").Prisma.InputJsonValue,
+      changes: { after: assignment } as unknown as import("@nexus/db").Prisma.InputJsonValue,
     },
   });