fix(mcp): deliver OAuth callback result over BroadcastChannel so COOP… #22682

Job	Run time
Build AMD64 (./docker/realtime.Dockerfile, ghcr.io/simstudioai/realtime, ECR_REALTIME)	42s
Build AMD64 (./docker/pii.Dockerfile, ghcr.io/simstudioai/pii, ECR_PII)	2m 41s
Build AMD64 (./docker/app.Dockerfile, ghcr.io/simstudioai/simstudio, ECR_APP)	5m 12s
Build AMD64 (./docker/db.Dockerfile, ghcr.io/simstudioai/migrations, ECR_MIGRATIONS)	27s
Test and Build / Build App	2m 39s
Detect Version	4s
Test and Build / Lint and Test	2m 33s
Check Docs Changes	0s
Migrate Dev DB	0s
Build ARM64 (GHCR Only)	0s
Deploy Trigger.dev (Dev)	0s
Build Dev ECR	0s
Migrate DB / Apply Database Migrations	25s
Promote Images	13s
Process Docs	0s
Create GHCR Manifests	0s
Create GitHub Release	0s
	14m 56s

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