Replace lexical-sort with icu

`lexical-sort` is unmaintained. The author recommends switching to the
official set of ICU crates.

src/localize.rs

@@ -1,11 +1,14 @@
 // SPDX-License-Identifier: GPL-3.0-only
 
+use std::str::FromStr;
 use std::sync::OnceLock;
 
 use i18n_embed::{
     fluent::{fluent_language_loader, FluentLanguageLoader},
     DefaultLocalizer, LanguageLoader, Localizer,
 };
+use icu_collator::{Collator, CollatorOptions, Numeric};
+use icu_provider::DataLocale;
 use rust_embed::RustEmbed;
 
 #[derive(RustEmbed)]
@@ -13,6 +16,7 @@ use rust_embed::RustEmbed;
 struct Localizations;
 
 pub static LANGUAGE_LOADER: OnceLock<FluentLanguageLoader> = OnceLock::new();
+pub static LANGUAGE_SORTER: OnceLock<Collator> = OnceLock::new();
 
 #[macro_export]
 macro_rules! fl {
@@ -51,3 +55,22 @@ pub fn localize() {
         eprintln!("Error while loading language for App List {}", error);
     }
 }
+
+pub fn sorter() -> &'static Collator {
+    LANGUAGE_SORTER.get_or_init(|| {
+        let mut options = CollatorOptions::new();
+        options.numeric = Some(Numeric::On);
+        let localizer = localizer();
+        let language_loader = localizer.language_loader();
+
+        DataLocale::from_str(&language_loader.current_language().to_string())
+            .or_else(|_| DataLocale::from_str(&language_loader.fallback_language().to_string()))
+            .ok()
+            .and_then(|locale| Collator::try_new(&locale, options).ok())
+            .or_else(|| {
+                let locale = DataLocale::from_str("en-US").expect("en-US is a valid BCP-47 tag");
+                Collator::try_new(&locale, options).ok()
+            })
+            .expect("Creating a collator from the system's current language, the fallback language, or American English should succeed")
+    })
+}

src/project.rs

@@ -89,7 +89,7 @@ impl Ord for ProjectNode {
                 }
             }
         }
-        lexical_sort::natural_lexical_cmp(self.name(), other.name())
+        crate::localize::sorter().compare(self.name(), other.name())
     }
 }