Fix issue where ListPrompt throws or hangs on null key input (empty text / blank read) 2168

[HillkirkLautaro]

Fixes #2168

• I have read the Contribution Guidelines
• I have checked that there isn't already another pull request that solves the above issue
• All newly added code is adequately covered by tests
• All existing tests are still running without errors

Changes

• Fixed a bug in ListPrompt.Show where a null value returned from _console.Input.ReadKeyAsync (such as during empty text/key reads) could cause a malformed loop structure or unhandled flow issues.
• Restructured the try-finally blocks and while loop handling for input reading, cursor visibility toggling (_console.Cursor.Hide() / Show()), and render hook refreshes.
• Added a new unit test suite (MultiSelectionPromptTests and ThrowingCursor) to ensure proper cursor management and behavior when hiding the cursor throws or when input is handled under edge conditions.
• Updated auto-generated emoji lookup mapping files.