feat(account): redesign identities page as a Noora providers table

Summary

• Redesign the account Identities page as a standard Noora <.card> + <.table> (Provider / Account / Status), matching the products settings page and filling the full content width.
• Drive each row off provider state: connected providers show their linked account id plus a Connected badge, configured-but-unlinked providers expose a Connect button to /auth/<provider>, and providers the instance has not enabled are dimmed with a Not configured badge.
• Make dev login deterministic by reusing the existing test@hive.dev user and ignoring requested personas; move the dev sign-in form ahead of the provider buttons on the login page and let it stretch full width.
• Seed github and oidc identities and harden the seed cleanup query so the page exercises connected, connectable, and unconfigured states.

Testing

• mix test (191 tests, 0 failures)
• mix compile --warnings-as-errors
• mix credo lib/hive_web/components/account_components.ex

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