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/app/(app)/estimates/EstimatesClient.tsx

@@ -2,7 +2,7 @@
 
 import { useMemo, useState } from "react";
 import Link from "next/link";
-import { EstimateStatus, type EstimateVersionStatus } from "@capakraken/shared";
+import { EstimateStatus, type EstimateVersionStatus } from "@nexus/shared";
 import { clsx } from "clsx";
 import { EstimateWizard } from "~/components/estimates/EstimateWizard.js";
 import { InfoTooltip } from "~/components/ui/InfoTooltip.js";
@@ -122,7 +122,8 @@ function EstimateDetailPanel({
       <div className="flex items-start justify-between gap-4">
         <div>
           <p className="text-xs font-semibold uppercase tracking-[0.2em] text-gray-400">
-            Estimate detail <InfoTooltip content="Pre-project cost and effort calculation. Estimates model staffing demand, scope, and financials before work begins." />
+            Estimate detail{" "}
+            <InfoTooltip content="Pre-project cost and effort calculation. Estimates model staffing demand, scope, and financials before work begins." />
           </p>
           <h2 className="mt-2 text-xl font-semibold text-gray-900 dark:text-gray-50">
             {estimate.name}
@@ -206,7 +207,8 @@ function EstimateDetailPanel({
             <section>
               <div className="flex items-center justify-between">
                 <h3 className="text-sm font-semibold text-gray-900 dark:text-gray-100">
-                  Scope items <InfoTooltip content="Deliverables or work packages that define what is included in this estimate." />
+                  Scope items{" "}
+                  <InfoTooltip content="Deliverables or work packages that define what is included in this estimate." />
                 </h3>
                 <span className="text-xs text-gray-400">{latestVersion.scopeItems.length}</span>
               </div>
@@ -239,7 +241,8 @@ function EstimateDetailPanel({
             <section>
               <div className="flex items-center justify-between">
                 <h3 className="text-sm font-semibold text-gray-900 dark:text-gray-100">
-                  Demand lines <InfoTooltip content="Staffing demand rows. Each line represents a role or resource with hours, cost rate, and sell rate." />
+                  Demand lines{" "}
+                  <InfoTooltip content="Staffing demand rows. Each line represents a role or resource with hours, cost rate, and sell rate." />
                 </h3>
                 <span className="text-xs text-gray-400">{latestVersion.demandLines.length}</span>
               </div>
@@ -345,13 +348,19 @@ function EstimateCard({
 
       <div className="mt-5 grid gap-3 sm:grid-cols-2">
         <div>
-          <p className="text-xs uppercase tracking-wide text-gray-400">Opportunity <InfoTooltip content="External CRM or sales reference ID linking this estimate to a sales opportunity." /></p>
+          <p className="text-xs uppercase tracking-wide text-gray-400">
+            Opportunity{" "}
+            <InfoTooltip content="External CRM or sales reference ID linking this estimate to a sales opportunity." />
+          </p>
           <p className="mt-1 text-sm text-gray-700 dark:text-gray-200">
             {estimate.opportunityId ?? "Not set"}
           </p>
         </div>
         <div>
-          <p className="text-xs uppercase tracking-wide text-gray-400">Updated <InfoTooltip content="When this estimate or any of its versions was last modified." /></p>
+          <p className="text-xs uppercase tracking-wide text-gray-400">
+            Updated{" "}
+            <InfoTooltip content="When this estimate or any of its versions was last modified." />
+          </p>
           <p className="mt-1 text-sm text-gray-700 dark:text-gray-200">
             {formatDateLong(estimate.updatedAt)}
           </p>
@@ -466,7 +475,7 @@ export function EstimatesClient() {
               No estimates yet
             </p>
             <p className="mt-2 text-sm text-gray-400 dark:text-gray-500">
-              Start with the wizard to create a connected estimate from CapaKraken data.
+              Start with the wizard to create a connected estimate from Nexus data.
             </p>
           </div>
         ) : (