test(e2e): add Slack connector Playwright journey

surfsense_web/tests/fixtures/connectors/slack.fixture.ts

@@ -0,0 +1,28 @@
+import { type ConnectorRow, deleteConnector, runSlackOAuth } from "../../helpers/api/connectors";
+import { searchSpaceFixtures } from "../search-space.fixture";
+
+export type SlackFixtures = {
+	/**
+	 * A pre-connected Slack connector inside the fixture's `searchSpace`.
+	 * OAuth and MCP tool calls use E2E Slack fakes and are cleaned up
+	 * automatically after the test.
+	 */
+	slackConnector: ConnectorRow;
+};
+
+export const slackFixtures = searchSpaceFixtures.extend<SlackFixtures>({
+	slackConnector: async ({ request, apiToken, searchSpace }, use) => {
+		const { connector } = await runSlackOAuth(request, apiToken, searchSpace.id);
+		if (!connector) {
+			throw new Error(
+				"slackConnector fixture: OAuth completed but no SLACK_CONNECTOR was created. " +
+					"Check the backend log — the Slack MCP fake likely rejected an unmodelled call."
+			);
+		}
+		try {
+			await use(connector);
+		} finally {
+			await deleteConnector(request, apiToken, connector.id);
+		}
+	},
+});