feat: add XDG autostart support for automatic application launching

feat: implement demo mode for automated feature showcase
feat: add XEmbed system tray protocol for external application icons
feat: add window snapping to left and right halves
feat: add minimize/restore toggle with Alt+F9 keybinding
docs: update README with new features and configuration details
build: update build system for new autostart and demo modules

site/index.html

@@ -27,6 +27,7 @@
                         <a href="configuration.html">Configuration</a>
                         <a href="ai-features.html">AI Features</a>
                         <a href="architecture.html">Architecture</a>
+                        <a href="design-patterns.html">Design Patterns</a>
                     </div>
                 </li>
                 <li><a href="https://retoor.molodetz.nl/retoor/dwn">Git</a></li>
@@ -93,8 +94,14 @@
                     <div class="feature-card">
                         <div class="feature-icon">&#128187;</div>
                         <h3>System Tray</h3>
-                        <p>Integrated system tray with battery, volume, and WiFi indicators.
-                           Volume slider and network selection dropdowns included.</p>
+                        <p>XEmbed protocol for external app icons (Telegram, Bluetooth, etc.) plus
+                           built-in battery, volume, and WiFi widgets with interactive controls.</p>
+                    </div>
+                    <div class="feature-card">
+                        <div class="feature-icon">&#9889;</div>
+                        <h3>XDG Autostart</h3>
+                        <p>Automatic startup of system services and tray applications following the
+                           XDG Autostart spec. Works with nm-applet, blueman, and more.</p>
                     </div>
                 </div>
             </div>
@@ -249,6 +256,7 @@ echo "exec dwn" >> ~/.xinitrc</code></pre>
                         <li><a href="shortcuts.html">Keyboard Shortcuts</a></li>
                         <li><a href="configuration.html">Configuration</a></li>
                         <li><a href="architecture.html">Architecture</a></li>
+                        <li><a href="design-patterns.html">Design Patterns</a></li>
                     </ul>
                 </div>
                 <div class="footer-section">