✨(frontend) add video tab to settings modal for camera configuration

Introduce new video tab in settings modal requested by users who found
it misleading to lack camera configuration options in settings.

Currently implements basic camera device selection. Future commits will
expand functionality to include resolution management, subscription
settings, and other video-related configurations.

src/frontend/src/locales/de/settings.json

@@ -30,6 +30,18 @@
     },
     "permissionsRequired": "Berechtigungen erforderlich"
   },
+  "video": {
+    "camera": {
+      "heading": "Kamera",
+      "label": "Wählen Sie Ihre Videoeingabe aus",
+      "disabled": "Kamera deaktiviert",
+      "previewAriaLabel": {
+        "enabled": "Videovorschau aktiviert",
+        "disabled": "Videovorschau deaktiviert"
+      }
+    },
+    "permissionsRequired": "Berechtigungen erforderlich"
+  },
   "notifications": {
     "heading": "Tonbenachrichtigungen",
     "label": "Tonbenachrichtigungen für",
@@ -54,6 +66,7 @@
   "tabs": {
     "account": "Profil",
     "audio": "Audio",
+    "video": "Video",
     "general": "Allgemein",
     "notifications": "Benachrichtigungen"
   }