Add self-contained e2e test harness with ephemeral PocketBase

Previously, 15 e2e tests were skipped because TEST_USER_EMAIL and
TEST_USER_PASSWORD env vars weren't set. Now the test harness:

- Starts a fresh PocketBase instance in /tmp on port 8091
- Creates admin user, collections, and API rules automatically
- Seeds test user with period data for authenticated tests
- Cleans up temp directory after tests complete

Also fixes:
- Override toggle tests now use checkbox role (not button)
- Adds proper wait for OVERRIDES section before testing toggles
- Suppresses document.cookie lint warning with explanation

Test results: 64 e2e tests pass, 1014 unit tests pass

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

playwright.config.ts

@@ -6,6 +6,13 @@ export default defineConfig({
   // Test directory for E2E tests
   testDir: "./e2e",
 
+  // Global setup/teardown for PocketBase harness
+  globalSetup: "./e2e/global-setup.ts",
+  globalTeardown: "./e2e/global-teardown.ts",
+
+  // Exclude vitest test files
+  testIgnore: ["**/pocketbase-harness.test.ts"],
+
   // Run tests in parallel
   fullyParallel: true,
 
@@ -37,10 +44,16 @@ export default defineConfig({
   projects: [{ name: "chromium", use: { ...devices["Desktop Chrome"] } }],
 
   // Run dev server before starting tests
+  // Note: POCKETBASE_URL is set by global-setup.ts for the test PocketBase instance
   webServer: {
     command: "pnpm dev",
     url: "http://localhost:3000",
     reuseExistingServer: !process.env.CI,
     timeout: 120 * 1000, // 2 minutes for Next.js to start
+    env: {
+      // Use the test PocketBase instance (port 8091)
+      NEXT_PUBLIC_POCKETBASE_URL: "http://127.0.0.1:8091",
+      POCKETBASE_URL: "http://127.0.0.1:8091",
+    },
   },
 });