feat(server): surface the global Kura endpoint as a clear banner

Improve how the global Kura cache endpoint is surfaced in account settings.

The account-settings “Kura cache servers” section already exposes a global endpoint that fans clients out to the nearest healthy region, but it was rendered as a cramped single-line size="small" alert that was easy to miss and didn’t read as a distinct, actionable piece of information.

This restructures it into a titled size="large" alert (Noora only renders an alert description at size="large"), with:

• A clear title (Global Kura endpoint) and the endpoint URL.
• Customer-facing copy (“It routes to the nearest healthy region automatically.”) with no infrastructure/vendor naming.

The visibility gating is unchanged: the banner still only appears once the global endpoint is active (probed healthy and mirrored into account_cache_endpoints). Also adds component-level tests for the banner and re-extracts the dashboard_account gettext template.

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