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/settings/McpSettings.cpp

@@ -34,14 +34,14 @@ bool load(McpSettings& settings) {
     auto mcp_enabled = map.find(KEY_MCP_ENABLED);
     settings.mcpEnabled = (mcp_enabled != map.end())
         ? (mcp_enabled->second == "1" || mcp_enabled->second == "true")
-        : false;
+        : true;
 
     return true;
 }
 
 McpSettings getDefault() {
     return McpSettings{
-        .mcpEnabled = false
+        .mcpEnabled = true
     };
 }