Suppress warning when test-results is empty

Playwright only writes to test-results/ on failure.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: richardkmichael

.github/workflows/test.yml

@@ -81,6 +81,7 @@ jobs:
           name: test-results
           path: test-results/
           retention-days: 7
+          if-no-files-found: ignore
 
   lint:
     runs-on: macos-latest