* Use GTK sink for Wayland liveview
Keep native Wayland sessions on the GTK backend and use a GTK widget based GStreamer sink for Bambu liveview instead of the Wayland video overlay path, which can render black on NVIDIA/Hyprland.
Keep the existing wxMediaCtrl path for X11 and continue preferring software H.264 decoding while demoting GL and hardware decoder paths that caused liveview crashes.
* Narrow Linux liveview fix to native Wayland
* Tighten native Wayland liveview setup
* Tighten Wayland liveview teardown and rank setup
* Package GStreamer gtksink for Wayland liveview
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Co-authored-by: SoftFever <softfeverever@gmail.com>
