feat(v2): boot /v2/dashboard through OrganizerLayoutV2 + AppShellV2

Replaces the Task 3 stub in pages-v2/dashboard.vue with the boot-proof
page (data-testid v2-dashboard, correct definePage meta). Adds the
Playwright CT smoke (appshell-boot.spec.ts) that mounts AppShellV2 in
Chromium and asserts both the shell root and slot content are visible;
uses page scope for the root-element assertion (CT component locator
only matches descendants, not the root itself). Full Plan-1 gate green:
typecheck 0 new errors, eslint clean, 5 vitest files / 21 tests + 2
component tests, vite build succeeded, typed-router has v2-dashboard.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

apps/app/tests/playwright-ct/v2/appshell-boot.spec.ts

@@ -0,0 +1,19 @@
+import { expect, test } from '@playwright/experimental-ct-vue'
+import AppShellV2 from '@/layouts/components/AppShellV2.vue'
+
+// Pinia is set up globally by playwright/index.ts's beforeMount hook
+// (createPinia per test). We do NOT use @pinia/testing's
+// createTestingPinia here: it requires Vitest's `vi.fn`, which is
+// absent in Playwright's Node runtime. See playwright/index.ts §Pinia.
+
+test('AppShellV2 mounts and renders content in the CT runner', async ({ mount, page }) => {
+  await mount(AppShellV2, {
+    slots: { default: '<section data-testid="v2-dashboard">v2 foundation OK</section>' },
+  })
+
+  // `data-testid="appshell-v2"` is on the component's own root element,
+  // so we query the page rather than the component locator (which only
+  // matches descendants of the root, not the root itself in CT).
+  await expect(page.getByTestId('appshell-v2')).toBeVisible()
+  await expect(page.getByTestId('v2-dashboard')).toContainText('v2 foundation OK')
+})