diff --git a/typescript-version/package-lock.json b/typescript-version/package-lock.json
index a135cb1..0165aa0 100644
--- a/typescript-version/package-lock.json
+++ b/typescript-version/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "twitch-vod-manager",
-  "version": "4.0.1",
+  "version": "4.0.2",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "twitch-vod-manager",
-      "version": "4.0.1",
+      "version": "4.0.2",
       "license": "MIT",
       "dependencies": {
         "axios": "^1.6.0",
diff --git a/typescript-version/package.json b/typescript-version/package.json
index a5ad734..464b056 100644
--- a/typescript-version/package.json
+++ b/typescript-version/package.json
@@ -1,6 +1,6 @@
 {
   "name": "twitch-vod-manager",
-  "version": "4.0.1",
+  "version": "4.0.2",
   "description": "Twitch VOD Manager - Download Twitch VODs easily",
   "main": "dist/main.js",
   "author": "xRangerDE",
@@ -8,6 +8,7 @@
   "scripts": {
     "build": "tsc",
     "start": "npm run build && electron .",
+    "test:e2e": "npm exec --yes --package=playwright -- node scripts/smoke-test.js",
     "pack": "npm run build && electron-builder --dir",
     "dist": "npm run build && electron-builder",
     "dist:win": "npm run build && electron-builder --win"
diff --git a/typescript-version/scripts/smoke-test.js b/typescript-version/scripts/smoke-test.js
new file mode 100644
index 0000000..43d6ac0
--- /dev/null
+++ b/typescript-version/scripts/smoke-test.js
@@ -0,0 +1,149 @@
+const { _electron: electron } = require('playwright');
+
+async function run() {
+  const electronPath = require('electron');
+  const app = await electron.launch({
+    executablePath: electronPath,
+    args: ['.'],
+    cwd: process.cwd()
+  });
+
+  const win = await app.firstWindow();
+  const issues = [];
+
+  win.on('pageerror', (err) => {
+    issues.push(`pageerror: ${String(err)}`);
+  });
+
+  win.on('console', (msg) => {
+    if (msg.type() === 'error') {
+      issues.push(`console.error: ${msg.text()}`);
+    }
+  });
+
+  await win.waitForTimeout(2500);
+
+  const globals = await win.evaluate(async () => {
+    const names = [
+      'showTab',
+      'addStreamer',
+      'refreshVODs',
+      'downloadClip',
+      'selectCutterVideo',
+      'startCutting',
+      'addMergeFiles',
+      'startMerging',
+      'saveSettings',
+      'checkUpdate',
+      'downloadUpdate',
+      'updateFromInput',
+      'updateFromSlider',
+      'runPreflight',
+      'retryFailedDownloads',
+      'toggleDebugAutoRefresh'
+    ];
+    const map = {};
+    for (const n of names) map[n] = typeof window[n];
+    return map;
+  });
+
+  await win.evaluate(() => {
+    window.showTab('clips');
+    window.showTab('cutter');
+    window.showTab('merge');
+    window.showTab('settings');
+    window.showTab('vods');
+  });
+
+  const input = win.locator('#newStreamer');
+  const randomName = `smoketest_${Date.now()}`;
+  await input.fill(randomName);
+  await win.evaluate(async () => {
+    await window.addStreamer();
+  });
+
+  const hasTempStreamer = await win.locator('#streamerList').innerText();
+
+  await win.evaluate(async (name) => {
+    await window.removeStreamer(name);
+  }, randomName);
+
+  await win.evaluate(async () => {
+    await window.selectStreamer('xrohat');
+  });
+
+  await win.waitForTimeout(3500);
+
+  const vodCount = await win.locator('.vod-card').count();
+
+  if (vodCount > 0) {
+    await win.locator('.vod-card .vod-btn.primary').first().click();
+    await win.waitForTimeout(500);
+  }
+
+  const queueCountAfterAdd = await win.locator('#queueCount').innerText();
+
+  const queueRemove = win.locator('#queueList .remove').first();
+  if (await queueRemove.count()) {
+    await queueRemove.click();
+    await win.waitForTimeout(300);
+  }
+
+  await win.evaluate(() => {
+    window.showTab('clips');
+  });
+
+  await win.fill('#clipUrl', '');
+  await win.evaluate(async () => {
+    await window.downloadClip();
+  });
+
+  const clipStatus = await win.locator('#clipStatus').innerText();
+
+  await win.evaluate(async () => {
+    await window.runPreflight(false);
+    await window.startCutting();
+    await window.startMerging();
+  });
+
+  const mergeButtonDisabled = await win.locator('#btnMerge').isDisabled();
+  const preflightText = await win.locator('#preflightResult').innerText();
+  const healthBadge = await win.locator('#healthBadge').innerText();
+
+  await app.close();
+
+  const failedGlobals = Object.entries(globals)
+    .filter(([, type]) => type !== 'function')
+    .map(([name, type]) => `${name}=${type}`);
+
+  const summary = {
+    failedGlobals,
+    hasTempStreamer: hasTempStreamer.includes(randomName),
+    vodCount,
+    queueCountAfterAdd,
+    clipStatus,
+    mergeButtonDisabled,
+    preflightText,
+    healthBadge,
+    issues
+  };
+
+  console.log(JSON.stringify(summary, null, 2));
+
+  const hasFailure =
+    failedGlobals.length > 0 ||
+    !summary.hasTempStreamer ||
+    summary.vodCount < 1 ||
+    !(summary.clipStatus.includes('Bitte URL eingeben') || summary.clipStatus.includes('Please enter a URL')) ||
+    !summary.mergeButtonDisabled ||
+    !summary.preflightText ||
+    !summary.healthBadge ||
+    summary.issues.length > 0;
+
+  process.exit(hasFailure ? 1 : 0);
+}
+
+run().catch((err) => {
+  console.error(err);
+  process.exit(1);
+});
diff --git a/typescript-version/src/index.html b/typescript-version/src/index.html
index 691c457..3a2d144 100644
--- a/typescript-version/src/index.html
+++ b/typescript-version/src/index.html
@@ -345,7 +345,7 @@
 
                     <div class="settings-card">
                         <h3 id="updateTitle">Updates</h3>
-                        <p id="versionInfo" style="margin-bottom: 10px; color: var(--text-secondary);">Version: v4.0.1</p>
+                        <p id="versionInfo" style="margin-bottom: 10px; color: var(--text-secondary);">Version: v4.0.2</p>
                         <button class="btn-secondary" id="checkUpdateBtn" onclick="checkUpdate()">Nach Updates suchen</button>
                     </div>
 
@@ -377,7 +377,7 @@
                     <div class="status-dot" id="statusDot"></div>
                     <span id="statusText">Nicht verbunden</span>
                 </div>
-                <span id="versionText">v4.0.1</span>
+                <span id="versionText">v4.0.2</span>
             </div>
         </main>
     </div>
diff --git a/typescript-version/src/main.ts b/typescript-version/src/main.ts
index dbe8c34..1c5bef1 100644
--- a/typescript-version/src/main.ts
+++ b/typescript-version/src/main.ts
@@ -8,7 +8,7 @@ import { autoUpdater } from 'electron-updater';
 // ==========================================
 // CONFIG & CONSTANTS
 // ==========================================
-const APP_VERSION = '4.0.1';
+const APP_VERSION = '4.0.2';
 const UPDATE_CHECK_URL = 'http://24-music.de/version.json';
 
 // Paths