fix: keep pieces run usable during login

[anthony-maio]

Summary

• add a background login path in BasicUser.login() for loop-mode auth flows
• route pieces run login and reconnect calls through the non-blocking path
• add regressions proving loop-mode login uses async auth and returns the prompt immediately

Testing

• python -m pytest tests/auth_commands_test.py

[Copilot]

Pull request overview

This PR updates the CLI login flow so that, when running in loop mode (pieces run), login/reconnect operations don’t block the prompt and can complete in the background.

Changes:

• Add an async/background login option to BasicUser.login() via an async_req flag.
• Route loop-mode pieces login (and loop-mode reconnect) through async login/connect paths and print a non-blocking sign-in message.
• Add regression tests asserting loop-mode login uses async auth and that async login returns immediately with a live background thread.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/pieces/command_interface/auth_commands.py	Uses async login/connect when Settings.run_in_loop is enabled to keep the prompt responsive.
src/pieces/_vendor/pieces_os_client/wrapper/basic_identifier/user.py	Adds async_req support to BasicUser.login() and refactors login completion into a helper.
tests/auth_commands_test.py	Adds tests for loop-mode async login and for BasicUser.login(async_req=True) returning a background thread.

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