Fix interactive tool selection in quarto install/update/uninstall

[cderv]

When running quarto install, quarto update, or quarto uninstall without arguments, the interactive tool selector shows the list but the selection always returns undefined.

Root Cause

Same issue as #9765 - Cliffy's Select.prompt() returns the selected value directly, but the code incorrectly accesses .value on the result.

Fix

Use the prompt() array syntax with a named field, same pattern as #9765.

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[cderv]

Building 'quarto.exe' for this branch: https://github.com/quarto-dev/quarto-cli/actions/runs/21256479552

Because it seems that cliffy in dev version does not work well - I can't select choices in the list with the arrow 🤷

[cderv]

Tested locally that this works as expected now. Glad we found it at last !!