Introduce a Module API to get application settings. (#34278)

* Add a module API to get application settings.

* fix test

apps/web/playwright/e2e/modules/settings.spec.ts

@@ -0,0 +1,34 @@
+/*
+Copyright 2026 Element Creations Ltd.
+
+SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE files in the repository root for full details.
+*/
+
+import { test, expect } from "../../element-web-test";
+import { getSampleFilePath } from "../../sample-files";
+
+test.describe("Settings API", () => {
+    test.use({
+        displayName: "Manny",
+        config: {
+            modules: ["/modules/settings-module.js"],
+            setting_defaults: {
+                language: "de",
+            },
+        },
+        page: async ({ page }, use) => {
+            await page.route("/modules/settings-module.js", async (route) => {
+                await route.fulfill({ path: getSampleFilePath("settings-module.js") });
+            });
+            await use(page);
+        },
+    });
+
+    test("should read a config-resolved setting value via api.settings.getValue", async ({ page }) => {
+        const dialogPromise = page.waitForEvent("dialog");
+        await page.goto("/");
+        const dialog = await dialogPromise;
+        expect(dialog.message()).toBe("de");
+    });
+});

apps/web/playwright/sample-files/settings-module.js

@@ -0,0 +1,16 @@
+/*
+Copyright 2026 Element Creations Ltd.
+
+SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE files in the repository root for full details.
+*/
+
+export default class SettingsModule {
+    static moduleApiVersion = "^*";
+    constructor(api) {
+        this.api = api;
+    }
+    async load() {
+        alert(this.api.settings.getValue("language"));
+    }
+}