feat(settings): label Gesture Control as (beta)

The gesture overlay is an opt-in experimental feature; flag it as beta in the
App Settings → Input toggle label.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/web/public/index.html

@@ -983,7 +983,7 @@
               <div id="appSettingsInputSection">
                 <div class="settings-section-header">Input</div>
                 <div class="settings-item" title="Enable the camera hand-tracking gesture overlay (applied on reload). The instance must run with CODEMAN_GESTURE=1.">
-                  <span class="settings-item-label">Gesture Control</span>
+                  <span class="settings-item-label">Gesture Control (beta)</span>
                   <label class="switch switch-sm">
                     <input type="checkbox" id="appSettingsGestureControl">
                     <span class="slider"></span>