Memory leaks with Window Border feature enabled

**Describe the bug**
When Windows Border feature of the extension enabled, and wl-copy or wl-paste is invoked, a memory leak occurs.

**To Reproduce**
Steps to reproduce the behavior:
1. Enable Window Border
2. Open a floating (!) terminal window and ensure you see the border around it
3. Open a RAM usage monitoring software of your choice
4. In the terminal, run `echo test | wl-copy` a couple of times (copies "test" to the system clipboard)
5. See the border flicker every time you run the command
6. See RAM usage go up without ever going down

**Screenshots**
On a clean Ubuntu 25.10 live ISO in a VM (Ubuntu's tiling assistant disabled):
https://github.com/user-attachments/assets/71e29263-0022-4bb0-8420-87cae82bda41

On my Fedora 43 (the issue is much, much worse here):
https://github.com/user-attachments/assets/60638ba1-f921-461a-b21d-15e1fdaf43c5

**Information (please complete the following):**
- Tiling Shell version: 17.3
- GNOME version: 49.4

**Additional context**

To really hammer the bug home, run `while true; do echo test | wl-copy; done` and be ready to hit Ctrl+C :)

I experience this issue while using Neovim with `:set clipboard+=unnamedplus`. This makes any act of copying and pasting interact directly with the clipboard via wl-copy. After a while of using Neovim like that the memory fills up and a shell restart is required.