Serialize headless UI tests to avoid dispatcher races - #45
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The Windows build-and-test job intermittently fails during Avalonia headless test cleanup with a cross-thread dispatcher exception. The affected window-action tests can open a real terminal session asynchronously, leaving PTY output callbacks active while Avalonia resets its dispatcher between tests.
Run the window-action tests with a settings-only initial activation so they exercise UI actions without starting a PTY; wait for initial activation before closing the final tab. Also serialize headless UI test classes, matching the existing Control test setup, to avoid concurrent dispatcher initialization.
Local validation: all 14 UI tests pass, including six consecutive runs after the settings-only startup change.