Linux: use GTK sink for Wayland Bambu liveview (#13432)

* 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>

scripts/linux.d/debian

@@ -10,6 +10,7 @@ REQUIRED_DEV_PACKAGES=(
     g++
     gettext
     git
+    gstreamer1.0-gtk3
     libcurl4-openssl-dev
     libdbus-1-dev
     libglew-dev