fix(web): add web app manifest so installed app keeps its scope - #4306

Bugbot Analysis Progress (3m 18s elapsed)

✅ Gathered PR context (12s)
✅ Completed bug detection (3m 5s)
✅ Posted analysis results (1s)

Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_4ca22d11-38b4-461f-9d23-74a0264d4407