Improve ControlKit UI introspection and tvOS diagnostics

[setoelkahfi]

Related Issue

Fixes #

Description

Type of Change

• Bug fix
• New feature
• Refactor (no functional change)
• Documentation update
• CI / tooling change

How Has This Been Tested?

• cargo test --all-features
• Manual testing (smb <command>)

Checklist

• cargo check --workspace passes
• cargo clippy --workspace --tests -- -D warnings passes
• cargo fmt --all -- --check passes
• No new unwrap() or expect() calls in production code
• No new mod.rs files introduced
• New dependencies added to root Cargo.toml and inherited with { workspace = true }
• Error messages are user-friendly and surfaced to the terminal

Release Notes

[sigit-code]

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