fix(inquirerer): handle empty filteredOptions in checkbox and autocomplete

[pyramation]

fix(inquirerer): handle empty filteredOptions in checkbox and autocomplete

Summary

Fixes a crash when filtering options in checkbox/autocomplete prompts results in zero matches and the user presses arrow keys or space.

The bug: When typing a filter like "ve" that matches no options, pressing UP arrow would set selectedIndex = filteredOptions.length - 1 = -1, causing Cannot read properties of undefined (reading 'name') when accessing filteredOptions[selectedIndex].

The fix:

• Added guards in UP_ARROW, DOWN_ARROW, and SPACE handlers to no-op when filteredOptions is empty
• Updated updateFilteredOptions() in checkbox to clamp indices when filtered results change (matching autocomplete's existing behavior)
• Applied same guards to autocomplete function for consistency

Review & Testing Checklist for Human

• Test the exact repro case: Run pgpm init, get to the extensions checkbox, type "ve" (or any filter with no matches), then press UP/DOWN arrows - should no longer crash
• Verify the UX when no options match - should display empty list without crashing
• Check that normal filtering + navigation still works correctly when there ARE matching options

Notes

• The fix is defensive programming - guards against empty arrays before doing index math
• Could not test interactively since this requires TTY interaction
• Link to Devin run: https://app.devin.ai/sessions/e424b0eaba2f4789815bb0cc22ca6233
• Requested by: Dan Lynch (@pyramation)

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