feat: implement sorting functionality for skins using default windows sorting algotythm

src/lib/sort.ts

@@ -0,0 +1,22 @@
+const specialOrder = "'-!#$%&(),;@[]^_`{}~+=";
+
+const priority = Object.fromEntries([...specialOrder].map((c, i) => [c, i]));
+
+const osuSkinsCollator = new Intl.Collator(undefined, {
+  numeric: true,
+  sensitivity: 'base',
+});
+
+export const sortSkins = (skins: { name: string, author: string | undefined, modified: number}[]) =>
+  skins.sort((a, b) => {
+    const pa = priority[a.name[0]];
+    const pb = priority[b.name[0]];
+
+    if (pa !== undefined || pb !== undefined) {
+      if (pa === undefined) return 1;
+      if (pb === undefined) return -1;
+      return pa - pb;
+    }
+
+    return osuSkinsCollator.compare(a.name, b.name);
+  });