Add cloud-init support for automated KDE installation: include a new example user-data file for EMMC provisioning that installs KDE Plasma with touch options, sets it as the default session, and configures the on-screen keyboard. Update documentation to reflect these changes. Enhance eMMC provisioning scripts with new shrink functionality and improve error handling in backup processes.

chromium-setup/KDE-INSTALLATION-GUIDE.md

@@ -113,6 +113,16 @@ ps aux | grep -i plasma
 
 ---
 
+## Cloud-Init (Automated Install)
+
+For EMMC provisioning you can install KDE, set it as the default session, and enable touch options automatically using cloud-init. Use the example that includes KDE and touch:
+
+- **File:** `emmc-provisioning/cloud-init/user-data-kiosk-username-ssh.example`
+
+It installs `kde-plasma-desktop`, `maliit-keyboard`, and `xinput-calibrator`; sets LightDM default session to Plasma (X11); writes KDE config for touch-friendly scaling and touch-point feedback; and autostarts the on-screen keyboard. Chromium kiosk and SSH are configured in the same example. Replace the password hash and use it as your cloud-init `user-data` when building the image.
+
+---
+
 ## Reverting to LXDE
 
 ### Method 1: Switch at Login Screen (Easiest)