feat(e2e): add Playwright E2E test suite for critical user journeys (GRO-306)

Implements the automated Playwright E2E suite as the pre-UAT gate following
the UAT failures identified in GRO-299. Creates 5 test files in apps/web/e2e/:

- portal-auth.spec.ts: verifies client portal auth (client name shown, not "Hi, Guest")
- portal-data.spec.ts: verifies portal sections render without auth gates
- admin-services.spec.ts: asserts no duplicate service names in admin/services and booking wizard
- admin-reports.spec.ts: verifies reports page shows non-zero data for last 60 days
- console-health.spec.ts: asserts no 404s for favicon/PWA assets and no JS exceptions

Also adds:
- apps/web/e2e/ with Playwright config targeting groombook.dev.farh.net
- Shared fixtures with storageState-based auth via dev login selector
- test:e2e npm script in apps/web/package.json
- web-e2e CI job targeting PRs (runs after deploy-dev)

Note: Tests 1 & 2 (portal auth/data) depend on GRO-300 being deployed.
Tests 3-5 run against current dev state.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.github/workflows/ci.yml

@@ -281,6 +281,39 @@ jobs:
               ].join('\n')
             });
 
+  web-e2e:
+    name: Web E2E (Dev)
+    runs-on: ubuntu-latest
+    needs: [docker, deploy-dev]
+    if: github.event_name == 'pull_request'
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: pnpm/action-setup@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: pnpm
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Install Playwright browsers
+        run: pnpm --filter @groombook/web exec playwright install --with-deps chromium
+
+      - name: Run Web E2E tests
+        run: pnpm --filter @groombook/web test:e2e
+        timeout-minutes: 10
+
+      - name: Upload Playwright report
+        if: failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: playwright-web-e2e-report
+          path: apps/web/playwright-report/
+          retention-days: 7
+
   cd:
     name: Update Infra Image Tags
     runs-on: ubuntu-latest