feat(account): add identity management page

Summary

• Add an account-specific layout with an Identities sidebar item separate from the organization dashboard navigation.
• Add an Identities LiveView that lists connected OAuth provider identities and available configured providers to connect.
• Show provider-specific icons for Google, GitHub, and Okta, and seed dev identity data so the connected and connectable states are visible.
• Add OpenGraph metadata and focused LiveView/layout coverage for the new account page.

Testing

• mix format
• mix test test/hive_web/live/account_live/identities_test.exs test/hive_web/components/layouts_test.exs
• mix test

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