ci: reuse built ui dist in release dry-run

scripts/prepare-server-ui-dist.sh

@@ -3,13 +3,26 @@ set -euo pipefail
 
 # prepare-server-ui-dist.sh — Build the UI and copy it into server/ui-dist.
 # This keeps @paperclipai/server publish artifacts self-contained for static UI serving.
+# When PAPERCLIP_RELEASE_REUSE_UI_DIST=1 and ui/dist already exists, reuse that
+# output instead of rebuilding it again inside the release packaging flow.
 
 REPO_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
 UI_DIST="$REPO_ROOT/ui/dist"
 SERVER_UI_DIST="$REPO_ROOT/server/ui-dist"
 
-echo "  -> Building @paperclipai/ui..."
-pnpm --dir "$REPO_ROOT" --filter @paperclipai/ui build
+should_reuse_existing_ui_dist=false
+case "${PAPERCLIP_RELEASE_REUSE_UI_DIST:-}" in
+  1|true|TRUE|yes|YES)
+    should_reuse_existing_ui_dist=true
+    ;;
+esac
+
+if [ "$should_reuse_existing_ui_dist" = true ] && [ -f "$UI_DIST/index.html" ]; then
+  echo "  -> Reusing existing @paperclipai/ui dist output"
+else
+  echo "  -> Building @paperclipai/ui..."
+  pnpm --dir "$REPO_ROOT" --filter @paperclipai/ui build
+fi
 
 if [ ! -f "$UI_DIST/index.html" ]; then
   echo "Error: UI build output missing at $UI_DIST/index.html"

scripts/release.sh

@@ -198,6 +198,10 @@ fi
 
 set_cleanup_trap
 
+# The release flow already prepares ui/dist before packaging. Reuse that output
+# so server prepack does not rebuild the UI a second time during preview/publish.
+export PAPERCLIP_RELEASE_REUSE_UI_DIST=1
+
 if [ "$skip_verify" = false ]; then
   release_info ""
   release_info "==> Step 1/7: Verification gate..."