greeter: New Greeter Settings UI & Sync fixes

- Add PAM Auth via GUI
- Added new sync flags
- Refactored cache directory management & many others
- Fix for wireplumber permissions
- Fix for polkit auth w/icon
- Add pam_fprintd timeout=5 to prevent 30s auth blocks when using password

quickshell/Modules/Lock/Pam.qml

@@ -284,7 +284,7 @@ Scope {
     Process {
         id: availProc
 
-        command: ["sh", "-c", "fprintd-list $USER"]
+        command: ["sh", "-c", "fprintd-list \"${USER:-$(id -un)}\""]
         onExited: code => {
             fprint.available = code === 0;
             fprint.checkAvail();