diff --git a/firmware/website/AGENTS.md b/firmware/website/AGENTS.md
new file mode 100644
index 0000000..9b32779
--- /dev/null
+++ b/firmware/website/AGENTS.md
@@ -0,0 +1,67 @@
+# AGENTS.md
+
+## Project Overview
+This is a Svelte-based web frontend for a model railway system control, using Vite for build tooling and SPA routing via `svelte-spa-router`. The app is structured around two main tabs: Control and Config, with a captive portal route for special cases.
+
+## Architecture & Data Flow
+- **Entry Point:** `src/main.js` mounts the root Svelte component (`app.svelte`) to the DOM.
+- **Routing:** Defined in `app.svelte` using `svelte-spa-router`. Routes are:
+  - `/` → redirects to `/control`
+  - `/control` → ControlTab
+  - `/config` → ConfigTab
+  - `/captive` → Captive Portal
+- **State Management:**
+  - Centralized via Svelte stores, especially `controlStore` in `src/stores/controlStore.ts`.
+  - `controlStore` manages system state, communicates with backend via REST and WebSocket, and exposes methods for light, mode, and schema changes.
+  - WebSocket auto-reconnects and is only active when there are subscribers.
+- **Internationalization:**
+  - Language state managed in `src/i18n/store.ts`.
+  - Translations loaded from `src/i18n/de.json` and `src/i18n/en.json`.
+  - Language switching persists in `localStorage`.
+
+## Developer Workflows
+- **Build:** `npm run build` (outputs to `../storage/website`)
+- **Dev Server:** `npm run dev` (port 5173, strict)
+- **Preview:** `npm run preview`
+- **Testing:** `npm run test` (uses Vitest, tests in `src/stores/controlStore.test.ts`)
+- **Versioning:**
+  - App version and commit hash injected via `vite.config.js` (from `../version.txt` and `git rev-parse`).
+  - Displayed in footer.
+
+## Project-Specific Patterns
+- **Tab Navigation:**
+  - Implemented via `TabBar` and `TabButton` components.
+  - Active tab is derived from route.
+- **Control Logic:**
+  - All control actions (light, mode, schema) use latest-only sender pattern to avoid race conditions.
+  - REST endpoints: `/api/light/status`, `/api/light/power`, `/api/light/mode`, `/api/light/schema`.
+  - WebSocket endpoint: `/ws`.
+- **Styling:**
+  - TailwindCSS and PicoCSS used for styling.
+  - Custom themes and responsive layouts.
+- **Component Structure:**
+  - Common UI elements in `src/components/common/`.
+  - Control-specific UI in `src/components/control/`.
+  - Config-specific UI in `src/components/config/`.
+
+## Integration Points
+- **Backend:**
+  - Communicates via REST and WebSocket (see endpoints above).
+  - Host resolution adapts for dev/prod.
+- **External Libraries:**
+  - GSAP for animations.
+  - TailwindCSS, PicoCSS, Fontsource for UI.
+
+## Examples
+- To add a new control action, extend `controlStore` and update relevant Svelte components.
+- To add a new language, add a JSON file in `src/i18n/` and update `translations` in `index.ts`.
+- To debug state, use browser devtools and subscribe to Svelte stores.
+
+## Key Files
+- `src/app.svelte` (routing, layout)
+- `src/stores/controlStore.ts` (state, backend communication)
+- `src/i18n/store.ts` (language state)
+- `vite.config.js` (build, versioning)
+- `src/components/` (UI)
+
+_Last updated: 2026-03-17_
diff --git a/firmware/website/src/stores/controlStore.test.ts b/firmware/website/src/stores/controlStore.test.ts
index f7d794d..0971c88 100644
--- a/firmware/website/src/stores/controlStore.test.ts
+++ b/firmware/website/src/stores/controlStore.test.ts
@@ -55,26 +55,6 @@ describe('controlStore', () => {
 		});
 	});
 
-	it('update values posts updates and applies returned state', async () => {
-		const { fetchMock, controlStore } = await setupStore(
-			vi.fn().mockResolvedValueOnce(okResponse({}))
-		);
-		await controlStore.setMode({ mode: 'night' });
-
-		expect(fetchMock).toHaveBeenCalledWith(expect.stringMatching(/\/api\/light\/mode$/), {
-			method: 'POST',
-			headers: { 'Content-Type': 'application/json' },
-			body: JSON.stringify({ mode: 'night' })
-		});
-		expect(get(controlStore)).toEqual({
-			on: false,
-			mode: 'night',
-			schema: 'schema_01.csv',
-			color: { r: 0, g: 0, b: 0 },
-			clock: '00:00'
-		});
-	});
-
 	it('fetchState throws on non-ok response', async () => {
 		const { controlStore } = await setupStore(
 			vi.fn().mockResolvedValue({
@@ -112,6 +92,17 @@ describe('controlStore', () => {
 		});
 	});
 
+	it('setSchema posts to /api/light/schema', async () => {
+		const { fetchMock, controlStore } = await setupStore();
+		await controlStore.setSchema({ schema: 'schema_01.csv' });
+
+		expect(fetchMock).toHaveBeenCalledWith(expect.stringMatching(/\/api\/light\/schema$/), {
+			method: 'POST',
+			headers: { 'Content-Type': 'application/json' },
+			body: JSON.stringify({ schema: 'schema_01.csv' })
+		});
+	});
+
 	it('setLight coalesces pending updates while request is in flight', async () => {
 		const first = deferred<FetchResponse>();
 		const { fetchMock, controlStore } = await setupStore(
diff --git a/firmware/website/src/stores/controlStore.ts b/firmware/website/src/stores/controlStore.ts
index 9f98780..365bed9 100644
--- a/firmware/website/src/stores/controlStore.ts
+++ b/firmware/website/src/stores/controlStore.ts
@@ -1,6 +1,6 @@
 import { writable } from 'svelte/store';
-import { createLogger } from './logger';
-import { createLatestOnlySender } from './common';
+import { createLogger } from '../utils/logger';
+import { createLatestOnlySender } from './utils';
 
 // Types for state and REST/WebSocket messages
 export interface ControlState {
@@ -131,7 +131,6 @@ const createControlStore = () => {
 				headers: { 'Content-Type': 'application/json' },
 				body: JSON.stringify(payload)
 			});
-			applyState(payload);
 		},
 		(current, incoming) => ({ ...(current ?? {}), ...incoming })
 	);
@@ -143,7 +142,6 @@ const createControlStore = () => {
 				headers: { 'Content-Type': 'application/json' },
 				body: JSON.stringify(payload)
 			});
-			applyState(payload);
 		},
 		(current, incoming) => ({ ...(current ?? {}), ...incoming })
 	);
@@ -155,7 +153,6 @@ const createControlStore = () => {
 				headers: { 'Content-Type': 'application/json' },
 				body: JSON.stringify(payload)
 			});
-			applyState(payload);
 		},
 		(current, incoming) => ({ ...(current ?? {}), ...incoming })
 	);
diff --git a/firmware/website/src/stores/common.ts b/firmware/website/src/stores/utils.ts
similarity index 100%
rename from firmware/website/src/stores/common.ts
rename to firmware/website/src/stores/utils.ts
diff --git a/firmware/website/src/stores/logger.ts b/firmware/website/src/utils/logger.ts
similarity index 100%
rename from firmware/website/src/stores/logger.ts
rename to firmware/website/src/utils/logger.ts
diff --git a/firmware/website/vite.config.js b/firmware/website/vite.config.js
index cd0f517..dfb18d0 100644
--- a/firmware/website/vite.config.js
+++ b/firmware/website/vite.config.js
@@ -14,6 +14,11 @@ export default defineConfig({
     __COMMIT_HASH__: JSON.stringify(commitHash),
     __APP_VERSION__: JSON.stringify(version),
   },
+  test: {
+    sequence: {
+      shuffle: true,
+    }
+  },
   plugins: [
     svelte({
       configFile: 'svelte.config.js'