New-MCP-server approval dialog guards against stray keypresses, and can be suppressed

The dialog listing MCP servers newly found in a project now records when it opened and ignores both accept and cancel for a fixed window afterwards, so an Enter or Esc already in flight cannot answer it. Its writes to local settings go through the settings storage layer. Separately, the code that lists servers awaiting approval now returns an empty list, suppressing the dialog entirely, when an earlier condition holds; what that condition tests is not identifiable from the dialog code.