test: authenticated admin E2E suite + accessibility + visual regression baselines

- Global setup: authenticates as admin, saves storageState for reuse
- playwright.config.ts: 3 projects (setup, authenticated, unauthenticated)
- authenticated-admin.spec.ts: 16 admin pages tested with real auth session
- accessibility.spec.ts: axe-core scans on all admin, public, and portal pages
- visual-regression.spec.ts: dark mode baselines for key pages (toHaveScreenshot)
- @axe-core/playwright added as devDependency
- .gitignore updated: excludes .auth/ and test-results/

Full suite: 262 tests passing (setup:1, authenticated:52, unauthenticated:209)

cannamanage-frontend/playwright.config.ts

@@ -1,4 +1,7 @@
 import { defineConfig } from "@playwright/test"
+import path from "path"
+
+const authFile = path.join(__dirname, "e2e", ".auth", "admin.json")
 
 export default defineConfig({
   testDir: "./e2e",
@@ -12,6 +15,27 @@ export default defineConfig({
     navigationTimeout: 60_000,
     actionTimeout: 30_000,
   },
-  projects: [{ name: "chromium", use: { browserName: "chromium" } }],
+  projects: [
+    {
+      name: "setup",
+      testMatch: /global-setup\.ts/,
+    },
+    {
+      name: "authenticated",
+      testMatch:
+        /authenticated-admin|visual-regression|accessibility/,
+      dependencies: ["setup"],
+      use: {
+        storageState: authFile,
+        browserName: "chromium",
+      },
+    },
+    {
+      name: "unauthenticated",
+      testMatch:
+        /functional-flows|full-check|user-story-tests|system-test|staff-management|screenshot-tour|authenticated-tour/,
+      use: { browserName: "chromium" },
+    },
+  ],
   outputDir: "./e2e/test-results",
 })