feat(test): implement Playwright E2E and Dockerized testing infrastructure

playwright.config.ts

@@ -2,20 +2,29 @@ import { defineConfig, devices } from '@playwright/test';
 
 export default defineConfig({
   testDir: './tests/e2e',
+  timeout: 180000,
   fullyParallel: true,
   forbidOnly: !!process.env.CI,
   retries: process.env.CI ? 2 : 0,
   workers: process.env.CI ? 1 : undefined,
   reporter: 'html',
   use: {
-    baseURL: 'http://silverbullet-test:3000',
+    baseURL: process.env.SB_URL || 'http://localhost:3000',
     trace: 'on-first-retry',
     screenshot: 'only-on-failure',
+    headless: false,
   },
   projects: [
     {
-      name: 'chromium',
-      use: { ...devices['Desktop Chrome'] },
+      name: 'firefox',
+      use: { 
+        ...devices['Desktop Firefox'],
+        launchOptions: {
+          firefoxUserPrefs: {
+            'dom.securecontext.whitelist': 'http://localhost:3000,http://silverbullet-test:3000,http://mock-ics-server',
+          },
+        },
+      },
     },
   ],
 });