CmdPal: queue and execute <enter> input

### Description of the new feature / enhancement

Same as https://github.com/microsoft/PowerToys/issues/31918#issue-2185996256 .

### Scenario when this would be used?

Everyday for very frequent search launching apps.

> I remember using some other apps like powertoys Runner ( macOS spotlight or krunner on kde or others). Some of them seem to be able to queue input of so that when I input some words to search and hit before the search result is shown visually. It would correctly execute the first search result afterwards. Now with powertoys if I hit before the search result is shown it would have no effect.

> This could be used if you are very familiar with search results of keywords and you can access the result faster. The keywords and enter almost can be as fast as a pre defined keyboard shortcut. But the current behavior that you have to visually see the search result and then is effective is slower.

Start by reviewing the linked PowerToys issue and the CmdPal search-and-launch flow. Determine where Enter input is handled while results are still loading, then verify that an early Enter queues the action and executes the intended first result once available.

Written by the indexing model from the issue text.