Add Alt+1/Alt+2 quick-answer shortcuts to Classic True/False cards

[Copilot]

The True/False notetype lacked the same keyboard-driven answering flow available in other interactive templates. This PR adds direct shortcut answering so reviewers can answer TF items without mouse interaction.

• Shortcut behavior in TF entry

  • Added keyboard handling in templates/classic/src/entries/tf.tsx:
    • Alt+1 / Option+1 → True
    • Alt+2 / Option+2 → False
  • Shortcuts target the first unanswered TF item only, enabling fast sequential answering.
  • Shortcut handling is ignored on the back side.

• TF shortcut state helper

  • Added templates/classic/src/features/tf/shortcut.ts with getFirstUnansweredIndex(itemCount) to resolve which item should receive a hotkey action.

• Focused test coverage

  • Added templates/classic/tests/tf-shortcuts.test.ts for first-unanswered detection logic:
    • returns the next unanswered index when partial answers exist
    • returns -1 when all items are answered

• Docs update

  • Updated TF docs to document the new shortcuts:
    • apps/docs/src/en/templates/classic/tf.md
    • templates/classic/docs/tf.md

useKeyPress(['alt.1', 'alt.2'], (event, key) => {
  if (back || getFirstUnansweredIndex(itemCount) !== index) return;
  event.preventDefault();
  onStatusChange(key === 'alt.1'); // alt.1 => true, alt.2 => false
});

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Feature request] Hotkey/ Shortcut quick answering.</issue_title>
<issue_description>It would be amazing to have added hotkey/shortcut support on all of your notetypes.
Like in other notetypes that offer multiple choice.
There you can press alt 1 for option one, alt two for two etc. For the true false card it would be amazing as it would make the workflow so much faster.
Thank you so much for your work.</issue_description>

<agent_instructions>use node 24</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes [Feature request] Hotkey/ Shortcut quick answering. #169

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