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/Include/Tactility/settings/SystemSettings.h

@@ -6,7 +6,7 @@ namespace tt::settings {
 
 struct SystemSettings {
     Language language = Language::en_US;
-    bool timeFormat24h = true;
+    bool timeFormat24h = false;
     std::string dateFormat = std::string("DD/MM/YYYY"); // MM/DD/YYYY, DD/MM/YYYY, YYYY-MM-DD, YYYY/MM/DD
 };