feat: improve test setup and authentication handling

- Added `dev:test` script to package.json for streamlined testing without file watching.
- Introduced `kill-test-servers` script to ensure no existing servers are running on test ports before executing tests.
- Enhanced Playwright configuration to use mock agent for tests, ensuring consistent API responses and disabling rate limiting.
- Updated various test files to include authentication steps and handle login screens, improving reliability and reducing flakiness in tests.
- Added `global-setup` for e2e tests to ensure proper initialization before test execution.

apps/ui/scripts/kill-test-servers.mjs

@@ -0,0 +1,44 @@
+/**
+ * Kill any existing servers on test ports before running tests
+ * This ensures the test server starts fresh with the correct API key
+ */
+
+import { exec } from 'child_process';
+import { promisify } from 'util';
+
+const execAsync = promisify(exec);
+
+const SERVER_PORT = process.env.TEST_SERVER_PORT || 3008;
+const UI_PORT = process.env.TEST_PORT || 3007;
+
+async function killProcessOnPort(port) {
+  try {
+    const { stdout } = await execAsync(`lsof -ti:${port}`);
+    const pids = stdout.trim().split('\n').filter(Boolean);
+
+    if (pids.length > 0) {
+      console.log(`[KillTestServers] Found process(es) on port ${port}: ${pids.join(', ')}`);
+      for (const pid of pids) {
+        try {
+          await execAsync(`kill -9 ${pid}`);
+          console.log(`[KillTestServers] Killed process ${pid}`);
+        } catch (error) {
+          // Process might have already exited
+        }
+      }
+      // Wait a moment for the port to be released
+      await new Promise((resolve) => setTimeout(resolve, 500));
+    }
+  } catch (error) {
+    // No process on port, which is fine
+  }
+}
+
+async function main() {
+  console.log('[KillTestServers] Checking for existing test servers...');
+  await killProcessOnPort(Number(SERVER_PORT));
+  await killProcessOnPort(Number(UI_PORT));
+  console.log('[KillTestServers] Done');
+}
+
+main().catch(console.error);