Advance routine setup repairs automatically

[Staphylococcus]

Summary

Fixes #284.

Starting setup now approves routine installation/repair work for the shared flow. GUI and CLI advance through remaining services and Plasma work automatically, skipping verified or inapplicable requirements.

• Handle setup completion before the modal's opening frames; queued dismissal is cancelled if setup reopens.
• Preserve the existing setup splash CTA and modal. Opening the ordinary UI or reading assessments never starts repairs.
• Pause for TV input/approval, native authorization when needed, explicit build-dependency consent, and failed/blocked work. Retain flow-scoped authorization reuse and explicit retry.
• Keep failed/blocked post-step verification visible instead of silently probing past it.
• Propagate CLI progress/output errors before another repair starts, while allowing a noncancelable current mutation to finish.
• Preserve cancellation gates, whole-flow exclusion, saved settings, and final verification: the GUI still waits for fresh daemon confirmation; CLI completion remains locally verified.

This changes progression, not step presentation or installation requirements.

Validation

• cargo test --locked -p lg-buddy: all tests pass, including 1,426 library tests and 155 Cucumber scenarios (1,988 steps); one existing hardware test is ignored.
• cargo clippy --workspace --all-targets --all-features -- -D warnings.
• Display-backed GTK/controller suite on Nix and Ubuntu 24.04 / libadwaita 1.5; 20 consecutive Ubuntu runs pass, including early dismissal and reopening regressions.
• Real CLI smoke via scripts/test-setup-cli.py, with loopback TV and isolated runtime.
• Regression coverage for output failures during pairing and services, safe/noncancelable work, failed/blocked verification, explicit retry, dependency consent, stale actions, and frontend progression.
• git diff --check.

TV, service, and authorization tests use isolated fixtures. Live hardware and a real native authorization dialog were not exercised.

Relates to #275 and #267.