Fix keyboard navigation crash when context menu has no filtered results

[Copilot]

The keyboard navigation in ContextMenu.tsx crashes when filteredActions is empty due to modulo-by-zero and negative index operations.

Changes

• Added guard conditions to handleKeyDown for ArrowDown/ArrowUp navigation
• Prevents (prev + 1) % 0 → NaN and 0 - 1 → -1 when no results exist

case "ArrowDown":
case "Tab":
  if (filteredActions.length > 0) {
    setSelectedIndex((prev) => (prev + 1) % filteredActions.length);
  }
  break;
case "ArrowUp":
  if (filteredActions.length > 0) {
    setSelectedIndex((prev) =>
      prev === 0 ? filteredActions.length - 1 : prev - 1,
    );
  }
  break;

The existing useEffect already resets selectedIndex to 0 when filteredActions changes, so state remains consistent.

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[Copilot]

Pull request overview

This PR fixes a crash in keyboard navigation when the context menu has no filtered results. The issue occurred when users pressed arrow keys with an empty search result, causing NaN from modulo-by-zero operations and negative indices.

• Added guard conditions to prevent keyboard navigation when filteredActions is empty
• Guards prevent (prev + 1) % 0 → NaN and 0 - 1 → -1 edge cases