* tests: unblock three stale assertions broken on main
MLX CI on Mac M1 + Backend CI (both Repo tests CPU and Python 3.10/11/12/13)
have been red on every push to main for days. None of the underlying code
is wrong; three test files have stale anchors / assertions left behind by
PR #5537 (max_steps bump) and PR #5775 (composer + provision-desktop-auth).
1. tests/studio/run_real_mlx_smoke.py:393
PR #5537 bumped max_steps from 7 to 30 for seed-robust convergence but
left `assert len(losses_per_step) == 7`. With logging_steps=1 the
callback fires once per step; 30 entries, not 7. Track config.max_steps
so the gate auto-follows future bumps.
2. tests/studio/test_composer_rtl_bidi_attribute.py:29
PR #5775 changed the composer aria-label from the literal
`aria-label="Message input"` to a JSX ternary
`aria-label={overlay ? "Image edit instructions" : "Message input"}`.
Anchor on the inner string literal `"Message input"` instead.
3. studio/backend/tests/test_desktop_auth.py:487
The guarded_import in test_provision_desktop_auth_writes_secret_and_creates_db_without_backend_deps
blocks any import whose name == "utils", including the relative
`from .utils import echo` inside typer._click.decorators (typer 0.25+).
Gate the block on level == 0 so only absolute imports of `utils` /
`auth` / `fastapi` / `structlog` are rejected; relative imports
inside third-party packages pass through.
All three tests pass locally; the MLX one is a mechanical 7->config.max_steps
swap and will be exercised by MLX CI on this PR.
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