Fix IO List window binding crash and align launcher UX

[masarray]

Fixes

• fixes the unhandled WPF exception when opening an imported IO List workbook
• makes every read-only Run.Text binding in IoListTestingWindow explicitly Mode=OneWay
• covers EvidenceRecordCount, bound count, passed count, and pending count so the next get-only counter cannot trigger the same failure

First-run workflow UX

Removes the injected IO List Testing button from the top status/header area and turns the empty Explorer hero into two clear workflow cards:

1. General IEC 61850 Testing

   • Add IED
   • Open Project
   • manual discovery, live monitoring, event analysis, and engineering tools

2. FAT / IO List Testing

   • Open IO List Workbook
   • imported IED-scoped signals
   • automatic ordered ON/OFF timestamp evidence
   • dedicated read-only FAT workspace

At normal desktop width the cards appear side by side. The container wraps at narrower supported widths instead of overlapping.

Regression protection

• parses IoListTestingWindow.xaml and requires every bound Run to declare Mode=OneWay
• verifies the IO List entry point uses the first-run choice-card implementation
• rejects reintroduction of the old header-injection code

Scope

No changes to workbook import, IEC 61850 runtime, FAT state machine, or evidence journal semantics.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Keep the FAT launcher accessible with a selected IED

When a loaded IED is selected—the state required for a runnable FAT session—this relocates the launcher into the border bound to EmptyExplorerVisibility, which is collapsed whenever SelectedDevice != null (MainWindow.xaml.cs:103). The only repo-wide registration of OpenIoListTesting_Click is the new button inside this card, while session startup requires the imported IED to already be loaded, connected, and monitoring, so the normal operational state now has no visible way to open IO List Testing.

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