Launcher Startup Visuals

This supplement records the startup rules that are shared by the launcher and the desktop host.

Timeout behavior

30 seconds is a soft timeout.
Soft timeout means still starting, not failed.
When the host process is alive or Public IPC is connected, Launcher keeps waiting and avoids launching another host process.
120 seconds is the hard timeout for desktop_not_visible.

EnableSlideTransition = true resolves to SlideSplash and forces EnableFadeTransition = false.
EnableSlideTransition = false and EnableFadeTransition = false resolves to StaticSplash.
EnableSlideTransition = false and EnableFadeTransition = true resolves to Fade.

Fullscreen splash uses the shared logo_nightly.png asset.
Slide splash enters from the right edge of the target screen and exits back to the right edge.
Static splash uses the same fullscreen black surface without motion.

The hidden launcher debug menu can save a custom splash image.
The selected image is copied into the Launcher data directory as Launcher Picture.<ext>.
Supported formats are .png, .jpg, .jpeg, .bmp, .gif, and .webp; files larger than 10MB are rejected.
Splash displays the image with Uniform fitting, preserving the full image and allowing black letterboxing.
The splash window uses a transparent self-drawn shell with a fixed Fluent 8px outer corner radius.

Closing Launcher during startup does not cancel the startup attempt.
Relaunching Launcher attaches to the active attempt instead of spawning a second desktop process.
If a host process is still alive during failure handling, Launcher offers activation or continued waiting before any retry.