fix(plugin-git): make the SPA copy robust to Next export file modes

Next's static export emits entries with restrictive modes that node's cpSync
inherits and then trips over (EACCES); recreate the tree with explicit
directory/file permissions instead.

Author: antfubot

plugins/git/scripts/build-spa.mjs

@@ -1,6 +1,23 @@
-import { cpSync, rmSync } from 'node:fs'
+import { copyFileSync, mkdirSync, readdirSync, rmSync } from 'node:fs'
+import { join } from 'node:path'
 
 // The Next.js static export is the plugin's iframe SPA; it ships in the
 // lockstep `@devframes/plugin-git--assets` package, not the node package.
+
+// A manual walk with explicit modes: Next's export emits entries with
+// restrictive modes that node's `cpSync` inherits and then trips over, so
+// recreate the tree with normal directory/file permissions instead.
+function copyTree(src, dest) {
+  mkdirSync(dest, { recursive: true, mode: 0o755 })
+  for (const entry of readdirSync(src, { withFileTypes: true })) {
+    const from = join(src, entry.name)
+    const to = join(dest, entry.name)
+    if (entry.isDirectory())
+      copyTree(from, to)
+    else if (entry.isFile())
+      copyFileSync(from, to)
+  }
+}
+
 rmSync('assets-pkg/dist', { recursive: true, force: true })
-cpSync('app/out', 'assets-pkg/dist', { recursive: true })
+copyTree('app/out', 'assets-pkg/dist')