gpui_linux: Set _NET_WM_NAME on X11 window creation to support UTF-8 titles (#51909)

Release Notes:

- Fixed window title displaying garbled characters (e.g. "Zed â██
Settings") on Linux X11 due to missing UTF-8 encoding for the
`_NET_WM_NAME` property.
b5e85c80a3Valery Borovsky committed on 3/25/2026, 6:14:52 AM· committed by GitHubparent5baec85
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