Add empty state primary action emphasis token

[opascal221-design]

Summary
Add empty state primary action emphasis token

Scope

• apply shared emphasis token to empty-state primary actions\n- keep button text and behavior unchanged\n- ensure consistency across empty-state variants

Acceptance Criteria

• scoped change is implemented with no unrelated file churn
• docs/tests are updated where applicable
• contributor can validate the outcome locally

Contributor coordination: if you pick this up, reach out in Telegram for updates or clarification: https://t.me/accesslayerorg