fix(mobile): keep home brand visible during secondary retries - #21388

Eligibility
This is a focused mobile UI bug fix that separates usable-environment shell synchronization from secondary connection retries, preserving offline and unavailable states. The derived state change is small, localized, and covered by targeted tests, with no schema, deployment, security, default, or static-analysis changes.

Notes:
No code owners found in target merge base 07d38b8