feat(sessions): implement local user session switching functionality

- Core user is logged in tty1 while user two is in tty3, you can now seamlessly switch bewteen them
New IPC options:
- `dms ipc call sessions list`
- `dms switch-user [target]`
- New Powermenu switch users option

quickshell/Modules/Lock/LockScreenContent.qml

@@ -9,6 +9,7 @@ import Quickshell.Hyprland
 import Quickshell.Io
 import Quickshell.Services.Mpris
 import qs.Common
+import qs.Modals
 import qs.Services
 import qs.Widgets
 
@@ -1728,5 +1729,12 @@ Item {
                 Qt.callLater(() => passwordField.forceActiveFocus());
             }
         }
+        onSwitchUserRequested: {
+            switchUserPicker.showFromLockScreen();
+        }
+    }
+
+    SwitchUserModal {
+        id: switchUserPicker
     }
 }