feat(primevue): add PrimeVue plugin with Aura preset and Crewli teal tokens

Scaffolds apps/app/src/plugins/primevue/ as three files mirroring the
Vuetify plugin structure at apps/app/src/plugins/vuetify/:

- theme.ts — CrewliPreset extends Aura via definePreset(). Primary
  palette (50–950) is the exact token plan from RFC Appendix B,
  centered on Crewli teal #0D9394 (light primary, primary.500) and
  #0B7F80 (dark primary, primary.600). Surface tokens use Aura
  defaults. colorScheme.light/dark map primary.color, hover, active,
  and contrastColor per Appendix B.

- defaults.ts — empty pt (PassThrough) defaults object. F3 ships this
  scaffold; F4 sub-packages populate component-level defaults as each
  Vuetify surface migrates.

- index.ts — installPrimeVue(app) registers PrimeVue with the preset,
  Dutch locale (primelocale/nl.json → nl.nl), darkModeSelector: '.dark'
  (matches Vuexy convention per AD-2), and the three services Toast,
  Confirmation, Dialog.

Theme imports use @primeuix/themes (the maintained successor PrimeVue's
official docs prescribe), not RFC v1.0's @primevue/themes. See B1 commit
for substitution rationale. RFC will be aligned in B9.

The plugin is not yet registered in main.ts — that lands in B4 after
Tailwind v4 wiring (B3).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/app/src/plugins/primevue/theme.ts

@@ -0,0 +1,55 @@
+// Crewli Aura preset. Token values per RFC-WS-FRONTEND-PRIMEVUE Appendix B.
+//
+// Primary palette derives from Crewli teal #0D9394 (light primary) and
+// #0B7F80 (dark primary) — the same values the Vuetify side uses at
+// apps/app/src/plugins/vuetify/theme.ts. The two themes are intentionally
+// kept in lockstep during the F3–F6 parallel-mode window so that pages
+// in either framework render with identical brand color.
+//
+// Imports use @primeuix/themes (PrimeVue 4's officially documented theme
+// package, per primevue.org/vite/), substituting RFC v1.0's reference to
+// the deprecated @primevue/themes. See B1 commit for rationale.
+
+import { definePreset } from '@primeuix/themes'
+import Aura from '@primeuix/themes/aura'
+
+export const staticPrimaryColor = '#0D9394'
+export const staticPrimaryDarkenColor = '#0B7F80'
+
+export const CrewliPreset = definePreset(Aura, {
+  semantic: {
+    primary: {
+      50: '#E6F4F4',
+      100: '#CCE9EA',
+      200: '#99D3D4',
+      300: '#66BDBE',
+      400: '#33A7A8',
+      500: '#0D9394',
+      600: '#0B7F80',
+      700: '#086B6C',
+      800: '#055758',
+      900: '#034344',
+      950: '#012F30',
+    },
+    colorScheme: {
+      light: {
+        primary: {
+          color: '{primary.500}',
+          contrastColor: '#ffffff',
+          hoverColor: '{primary.600}',
+          activeColor: '{primary.700}',
+        },
+      },
+      dark: {
+        primary: {
+          color: '{primary.400}',
+          contrastColor: '{surface.900}',
+          hoverColor: '{primary.300}',
+          activeColor: '{primary.200}',
+        },
+      },
+    },
+  },
+})
+
+export default CrewliPreset