fix(composer): support spaces in file mentions - #2625

Bugbot Analysis Progress (2m 13s elapsed)

✅ Gathered PR context (4s)
✅ Completed bug detection (2m 8s)
✅ Posted analysis results (1s)

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

Request ID: serverGenReqId_a62de7b6-bcef-4bfd-9c0f-3bffb8fca0d1