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>

samples/Dispov2/plan-country-sah-fte.md

@@ -6,7 +6,7 @@
 
 ## Problem
 
-CapaKraken currently uses a flat `hoursPerDay` on allocations. The chargeability reporting model requires:
+Nexus currently uses a flat `hoursPerDay` on allocations. The chargeability reporting model requires:
 
 - Country-specific daily working hours (8h Germany, 9h India, variable Spain)
 - Public holidays per country AND metro city
@@ -33,23 +33,23 @@ SAH = effectiveHoursPerDay * (workingDaysInPeriod - absenceDays)
 
 ### Daily Working Hours by Country
 
-| Country | Daily Hours | Special Rules |
-|---|---|---|
-| Costa Rica | 8h | - |
-| Germany | 8h | - |
-| Hungary | 8h | - |
-| India | 9h | - |
-| Italy | 8h | - |
-| Portugal | 8h | - |
-| Spain | variable | Fridays always 6.5h; Mon-Thu 6.5h during 1 Jul - 15 Sep, otherwise 9h |
-| United Kingdom | 8h | - |
+| Country        | Daily Hours | Special Rules                                                         |
+| -------------- | ----------- | --------------------------------------------------------------------- |
+| Costa Rica     | 8h          | -                                                                     |
+| Germany        | 8h          | -                                                                     |
+| Hungary        | 8h          | -                                                                     |
+| India          | 9h          | -                                                                     |
+| Italy          | 8h          | -                                                                     |
+| Portugal       | 8h          | -                                                                     |
+| Spain          | variable    | Fridays always 6.5h; Mon-Thu 6.5h during 1 Jul - 15 Sep, otherwise 9h |
+| United Kingdom | 8h          | -                                                                     |
 
 ### FTE Impact
 
 - FTE is stored with at least 2 decimal places (e.g. 0.50, 0.80)
 - FTE can change per month (contract changes, joiners/leavers)
-- Part-time 50% in Germany: 8h * 0.50 = 4h effective daily hours
-- Part-time 80% in India: 9h * 0.80 = 7.2h effective daily hours
+- Part-time 50% in Germany: 8h \* 0.50 = 4h effective daily hours
+- Part-time 80% in India: 9h \* 0.80 = 7.2h effective daily hours
 
 ## Schema Changes
 
@@ -114,8 +114,8 @@ interface SAHInput {
   fte: number;
   periodStart: Date;
   periodEnd: Date;
-  publicHolidays: Date[];   // from country + metro city
-  absenceDays: Date[];       // vacation, illness, other
+  publicHolidays: Date[]; // from country + metro city
+  absenceDays: Date[]; // vacation, illness, other
 }
 
 interface SAHResult {
@@ -134,11 +134,11 @@ Spain schedule handling:
 
 ```typescript
 interface SpainScheduleRule {
-  type: 'spain';
-  fridayHours: number;           // 6.5
+  type: "spain";
+  fridayHours: number; // 6.5
   summerPeriod: { from: string; to: string }; // "07-01" to "09-15"
-  summerHours: number;           // 6.5
-  regularHours: number;          // 9.0
+  summerHours: number; // 6.5
+  regularHours: number; // 9.0
 }
 
 function getSpainDailyHours(date: Date, rule: SpainScheduleRule): number;