diff --git a/.gitea/workflows/ui-test.yaml b/.gitea/workflows/ui-test.yaml
index 97e0333..8cfb439 100644
--- a/.gitea/workflows/ui-test.yaml
+++ b/.gitea/workflows/ui-test.yaml
@@ -119,3 +119,16 @@ jobs:
           name: playwright-traces
           path: ui/frontend/test-results/
           retention-days: 14
+
+      - name: Remove root-owned build artifacts
+        if: always()
+        # In host-mode the job runs as root, so vite (test:pwa),
+        # svelte-kit and Playwright write these outputs root-owned into
+        # the shared host workspace. The act_runner (non-root) then
+        # cannot remove them at teardown ("unlinkat ... permission
+        # denied"), which spuriously fails this or a sibling job that
+        # inherits the dirty workspace (observed on go-unit). Clean them
+        # here while the step still has root, after the uploads above.
+        run: |
+          rm -rf ui/frontend/build ui/frontend/.svelte-kit \
+                 ui/frontend/test-results ui/frontend/playwright-report