perf(shell): prefer GPU rendering and throttle allocator trimming

shell/ferese-shell/Cargo.toml

@@ -22,8 +22,7 @@ ferese-config = { path = "../../crates/ferese-config" }
 ferese-protocols = { path = "../../crates/ferese-protocols", default-features = false, features = ["client"] }
 jiff.workspace = true
 libc.workspace = true
-# Keep GPU rendering available as a fallback/override. The shell defaults to
-# tiny-skia to avoid a second GPU initialization during desktop startup.
+# Prefer GPU rendering, retaining software rendering as a fallback/override.
 libcosmic = { workspace = true, features = ["wgpu", "a11y"] }
 freedesktop-desktop-entry = { version = "0.8.3", default-features = false }
 iced_accessibility.workspace = true