fix: replace missing lucide icons (Github, ImageResize), remove reactCompiler

Github icon doesn't exist in lucide-react 1.26.0, replaced with ExternalLink.
ImageResize doesn't exist, replaced with Crop.
reactCompiler requires babel-plugin-react-compiler which isn't installed.

Co-Authored-By: Kilo <kilo@kilo.ai>

frontend/next.config.ts

@@ -1,7 +1,6 @@
 import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
-  reactCompiler: true,
   turbopack: {
     root: process.cwd(),
   },