feat: add workspace rename dialog (#1429)

* feat: add workspace rename dialog

- Adds a modal dialog to rename the current workspace
- Supports both Niri (via IPC socket) and Hyprland (via hyprctl dispatch)
- Default keybinding: Ctrl+Shift+R to open the dialog
- Pre-fills with current workspace name
- Allows setting empty name to reset to default

* refactor: wrap WorkspaceRenameModal in LazyLoader

Reduces memory footprint when the modal is not in use.

quickshell/DMSShell.qml

@@ -644,6 +644,18 @@ Item {
         }
     }
 
+    LazyLoader {
+        id: workspaceRenameModalLoader
+
+        active: false
+
+        Component.onCompleted: PopoutService.workspaceRenameModalLoader = workspaceRenameModalLoader
+
+        WorkspaceRenameModal {
+            id: workspaceRenameModal
+        }
+    }
+
     LazyLoader {
         id: processListModalLoader