Optimize shell startup and include demo artwork

shell/ferese-shell/Cargo.toml

@@ -8,8 +8,8 @@ rust-version = "1.93"
 [dependencies]
 ferese-protocols = { path = "../../crates/ferese-protocols", default-features = false, features = ["client"] }
 jiff.workspace = true
-# Wallpaper resampling must not block the bar on iced's shared UI thread.
-# Keep tiny-skia available as libcosmic's fallback, but prefer GPU rendering.
+# Keep GPU rendering available as a fallback/override. The shell defaults to
+# tiny-skia to avoid a second GPU initialization during desktop startup.
 libcosmic = { workspace = true, features = ["wgpu"] }
 serde.workspace = true
 toml.workspace = true