Zero warnings on Windows and Linux, clippy included (W-02, L-02)

rustc and clippy are clean for the whole workspace, every target, on
both. clippy --fix moved test modules last and took the shorter
forms; long types got named aliases; ElyTree's form takes its title
and button words as one pair.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/ely-platform/src/locale.rs

@@ -26,7 +26,7 @@ fn platform() -> String {
 
 #[cfg(target_os = "linux")]
 fn platform() -> String {
-    resolve_env(|key| env::value(key))
+    resolve_env(env::value)
 }
 
 #[cfg(target_os = "windows")]