chore: finish frontend ESLint migration #18

Enable every plugin recommended preset and replace Biome with ESLint formatting.

Preserve API contracts and JSX whitespace; verify source, tests, builds and tooling.

packages/icons/vite.config.ts

@@ -2,7 +2,7 @@ import { defineConfig } from "vite";
 
 export default defineConfig({
 	build: {
-		lib: { entry: "src/index.ts", formats: ["es"], fileName: "index" },
+		lib: { entry: "src/index.ts", fileName: "index", formats: ["es"] },
 		rolldownOptions: { external: /^react(\/|$)/ },
 	},
 });