Streamline WinUI tray menu parity with WinForms

[Copilot]

The WinUI tray implementation needed a careful correctness pass to reduce generated noise, maintain parity with WinForms behavior, and keep the UI lean for packaging while preserving functionality targets.

• Session routing parity: Align tray session targets with WinForms by routing non-absolute session routes through the dashboard prefix.
• Menu actions correctness: Wire cron/service health actions consistently and prevent empty-action buttons from being active.
• Simplification: Remove unused flyout logic and keep menu text (e.g., auto-start) consistent with expected states.

Example (session routing pattern):

var target = sessionRoute.StartsWith("http", StringComparison.OrdinalIgnoreCase)
    ? sessionRoute
    : $"{DashboardBaseUrl}/{sessionRoute}";
OpenUri(target);

Original prompt

Go through the winUI teay with a fine tooth comb. Much of this code was generated and we want to look for correctness of patterns, order of operations, remembering that our goal is a clean and simple architecture with the least number of lines of code necessary to do the job. We wanted to have parody with the winforms version, we want to look nice, we want to be easily packaged in the smallest possible, and eventually we want to get it to the level where it has similar functionality to the Mac version

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