Add Playwright fixtures with 5 test user types for e2e tests

Creates test infrastructure to enable previously skipped e2e tests:
- Onboarding user (no period data) for setup flow tests
- Established user (period 14 days ago) for normal usage tests
- Calendar user (with calendarToken) for ICS feed tests
- Garmin user (valid tokens) for connected state tests
- Garmin expired user (expired tokens) for expiry warning tests

Also fixes ICS feed route to strip .ics suffix from Next.js dynamic
route param, adds calendarToken to /api/user response, and sets
viewRule on users collection for unauthenticated ICS access.

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

playwright.config.ts

@@ -45,11 +45,12 @@ 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
+  // Note: POCKETBASE_URL is set for the test PocketBase instance on port 8091
+  // We never reuse existing servers to ensure the correct PocketBase URL is used
   webServer: {
     command: "pnpm dev",
     url: "http://localhost:3000",
-    reuseExistingServer: !process.env.CI,
+    reuseExistingServer: false,
     timeout: 120 * 1000, // 2 minutes for Next.js to start
     env: {
       // Use the test PocketBase instance (port 8091)