build(control-ui): prefer bun for UI build

scripts/ui.js

@@ -0,0 +1,102 @@
+#!/usr/bin/env node
+import { spawn } from "node:child_process";
+import fs from "node:fs";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+
+const here = path.dirname(fileURLToPath(import.meta.url));
+const repoRoot = path.resolve(here, "..");
+const uiDir = path.join(repoRoot, "ui");
+
+function usage() {
+  // keep this tiny; it's invoked from npm scripts too
+  process.stderr.write(
+    "Usage: node scripts/ui.js <install|dev|build|test> [...args]\n",
+  );
+}
+
+function which(cmd) {
+  try {
+    const key = process.platform === "win32" ? "Path" : "PATH";
+    const paths = (process.env[key] ?? process.env.PATH ?? "")
+      .split(path.delimiter)
+      .filter(Boolean);
+    const extensions =
+      process.platform === "win32"
+        ? (process.env.PATHEXT ?? ".EXE;.CMD;.BAT;.COM")
+            .split(";")
+            .filter(Boolean)
+        : [""];
+    for (const entry of paths) {
+      for (const ext of extensions) {
+        const candidate = path.join(entry, process.platform === "win32" ? `${cmd}${ext}` : cmd);
+        try {
+          if (fs.existsSync(candidate)) return candidate;
+        } catch {
+          // ignore
+        }
+      }
+    }
+  } catch {
+    // ignore
+  }
+  return null;
+}
+
+function resolveRunner() {
+  const bun = which("bun");
+  if (bun) return { cmd: bun, kind: "bun" };
+  const pnpm = which("pnpm");
+  if (pnpm) return { cmd: pnpm, kind: "pnpm" };
+  return null;
+}
+
+function run(cmd, args) {
+  const child = spawn(cmd, args, {
+    cwd: uiDir,
+    stdio: "inherit",
+    env: process.env,
+  });
+  child.on("exit", (code, signal) => {
+    if (signal) process.exit(1);
+    process.exit(code ?? 1);
+  });
+}
+
+const [, , action, ...rest] = process.argv;
+if (!action) {
+  usage();
+  process.exit(2);
+}
+
+const runner = resolveRunner();
+if (!runner) {
+  process.stderr.write(
+    "Missing UI runner: install bun or pnpm, then retry.\n",
+  );
+  process.exit(1);
+}
+
+const script =
+  action === "install"
+    ? null
+    : action === "dev"
+      ? "dev"
+      : action === "build"
+        ? "build"
+        : action === "test"
+          ? "test"
+          : null;
+
+if (action !== "install" && !script) {
+  usage();
+  process.exit(2);
+}
+
+if (runner.kind === "bun") {
+  if (action === "install") run(runner.cmd, ["install", ...rest]);
+  else run(runner.cmd, ["run", script, ...rest]);
+} else {
+  if (action === "install") run(runner.cmd, ["install", ...rest]);
+  else run(runner.cmd, ["run", script, ...rest]);
+}