Add npm test:e2e command and harden smoke checks (v4.0.2)

Expose a single runnable end-to-end test command for fast regression sweeps and update the smoke test to validate preflight and localization-aware clip errors reliably across language modes.

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>

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