startupfeedback: Fix and rework

Devin Linrequested to merge
work/devinlin/startupfeedback into master
  • Fixes startup feedback not having an icon
  • Add a loading spinner
  • Use a simpler opacity animation since TV screens are big, so a scale animation is more jarring
  • Fix showing behavior
  • Remove window decoration on startup feedback window
  • Hook into NanoShell.StartupNotifier so it shows when search results are activated
  • Add "Escape" shortcut to close

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