feat(ui): simplify family UI - hide advanced settings/apps, sane defaults

Hide from Settings: Bluetooth, Development, MCP Screen, Power,
Region & Language, Time & Date (APP_MANIFEST_FLAG_HIDDEN).

Hide from Apps list: App Hub, Chat, I2C Scanner, Notes,
Screenshot, System Info, Web Server.

Defaults: MCP on, WebServer on, America/New_York timezone,
12-hour time format.

Tactility/Source/app/apphub/AppHubApp.cpp

@@ -339,7 +339,8 @@ extern const ::AppManifest manifest = {
     .id = "tactility.apphub",
     .name = "App Hub",
     .category = APP_CATEGORY_SYSTEM,
-    .location = {APP_LOCATION_MEMORY, reinterpret_cast<void*>(appMain)}
+    .location = {APP_LOCATION_MEMORY, reinterpret_cast<void*>(appMain)},
+    .flags = APP_MANIFEST_FLAG_HIDDEN
 };
 
 } // namespace tt::app::apphub