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/admin/WebhooksClient.tsx

@@ -176,7 +176,7 @@ export function WebhooksClient() {
         <div>
           <h1 className="text-2xl font-bold text-gray-900 dark:text-white">Webhooks</h1>
           <p className="mt-1 text-sm text-gray-500 dark:text-gray-400">
-            Configure outbound webhooks to notify external services about events in CapaKraken.
+            Configure outbound webhooks to notify external services about events in Nexus.
           </p>
         </div>
         <button className={PRIMARY_BUTTON} onClick={openCreateModal}>
@@ -194,10 +194,7 @@ export function WebhooksClient() {
       ) : (
         <div className="space-y-3">
           {webhooks.map((wh) => (
-            <div
-              key={wh.id}
-              className="app-surface flex items-center gap-4 p-4"
-            >
+            <div key={wh.id} className="app-surface flex items-center gap-4 p-4">
               {/* Active indicator */}
               <div
                 className={`h-3 w-3 shrink-0 rounded-full ${
@@ -209,9 +206,7 @@ export function WebhooksClient() {
               {/* Info */}
               <div className="min-w-0 flex-1">
                 <div className="flex items-center gap-2">
-                  <span className="font-medium text-gray-900 dark:text-white">
-                    {wh.name}
-                  </span>
+                  <span className="font-medium text-gray-900 dark:text-white">{wh.name}</span>
                   {wh.url.includes("hooks.slack.com") && (
                     <span className="rounded bg-purple-100 px-1.5 py-0.5 text-xs font-medium text-purple-700 dark:bg-purple-900/40 dark:text-purple-300">
                       Slack
@@ -257,17 +252,12 @@ export function WebhooksClient() {
                 </button>
                 <button
                   className={SECONDARY_BUTTON}
-                  onClick={() =>
-                    handleToggleActive(wh.id, wh.isActive)
-                  }
+                  onClick={() => handleToggleActive(wh.id, wh.isActive)}
                   disabled={updateMut.isPending}
                 >
                   {wh.isActive ? "Disable" : "Enable"}
                 </button>
-                <button
-                  className={SECONDARY_BUTTON}
-                  onClick={() => openEditModal(wh)}
-                >
+                <button className={SECONDARY_BUTTON} onClick={() => openEditModal(wh)}>
                   Edit
                 </button>
                 {deleteConfirmId === wh.id ? (
@@ -282,18 +272,12 @@ export function WebhooksClient() {
                     >
                       Confirm
                     </button>
-                    <button
-                      className={SECONDARY_BUTTON}
-                      onClick={() => setDeleteConfirmId(null)}
-                    >
+                    <button className={SECONDARY_BUTTON} onClick={() => setDeleteConfirmId(null)}>
                       Cancel
                     </button>
                   </div>
                 ) : (
-                  <button
-                    className={SECONDARY_BUTTON}
-                    onClick={() => setDeleteConfirmId(wh.id)}
-                  >
+                  <button className={SECONDARY_BUTTON} onClick={() => setDeleteConfirmId(wh.id)}>
                     Delete
                   </button>
                 )}
@@ -335,9 +319,7 @@ export function WebhooksClient() {
 
             {/* Secret */}
             <div>
-              <label className={LABEL_CLASS}>
-                Secret (optional)
-              </label>
+              <label className={LABEL_CLASS}>Secret (optional)</label>
               <input
                 className={INPUT_CLASS}
                 type="password"