Add several improvements to the liveinst installer workflow:
- Expose archiso squashfs at /run/rootfsbase where Anaconda expects to find
the Live OS image, fixing SourceSetupError crashes
- Display immediate splash screen with zenity during Anaconda startup (2-4 min
wait time) to provide user feedback and prevent perceived hangs
- Wrap liveinst with dbus-run-session to provide D-Bus session bus, fixing
GLib.GError crashes from missing ScreenSaver service
- Add hardware summary log output to debug information collection
These changes address three crash scenarios identified during testing and
improve user experience during installer initialization.
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