Function compute_preflight_summary 

pub fn compute_preflight_summary(
    items: &[PackageItem],
    action: PreflightAction,
) -> PreflightSummaryOutcome

What: Compute preflight summary data using the system command runner.

Inputs:

• items: Packages scheduled for install/update/remove.
• action: Active operation (install vs. remove) shaping the analysis.

Output:

• PreflightSummaryOutcome combining Summary tab data and header chips.

Details:

• Delegates to compute_preflight_summary_with_runner with SystemCommandRunner.
• Metadata lookups that fail are logged and treated as best-effort.