Expose launcher build stamp

vite.config.ts

@@ -1,10 +1,29 @@
+import { execSync } from "node:child_process";
+import { readFileSync } from "node:fs";
 import { resolve } from "node:path";
 import { defineConfig } from "vite";
 import react from "@vitejs/plugin-react";
 
+const packageJson = JSON.parse(readFileSync(resolve(__dirname, "package.json"), "utf8")) as { version?: string };
+
+function readGitCommit(): string {
+  try {
+    return execSync("git rev-parse --short HEAD", { cwd: __dirname, stdio: ["ignore", "pipe", "ignore"] })
+      .toString()
+      .trim();
+  } catch {
+    return "dev";
+  }
+}
+
+const appBuildLabel = `v${packageJson.version || "0.0.0"}-${readGitCommit()}`;
+
 // https://vite.dev/config/
 export default defineConfig({
   plugins: [react()],
+  define: {
+    __APP_BUILD__: JSON.stringify(appBuildLabel),
+  },
   build: {
     rollupOptions: {
       input: {