Integrate native auth manager with current profile flow

[jasonsuhari]

Problem:

• origin/feat/native-auth-manager needs to be evaluated against the latest origin/main.
• Current main now has usage label, settings, and profile flow changes that must keep working.

Requested behavior:

• Integrate the native auth manager pieces that still fit current main.
• Preserve current main behavior for usage labels, settings, and profile selection/display.

Acceptance checks:

• Native auth manager integration builds against current main.
• Current usage-label/settings/profile behavior is preserved.
• npm test passes locally.
• A PR is opened to main for review; do not merge it automatically.