Enlace del tag de las flashcards a issues en GitHub

[Copilot]

Wraps the origin tag badge on flashcards with a link that opens a pre-filled GitHub issue for direct feedback, passing the flashcard ID.

• Helper function buildFlashcardIssueUrl(flashcardId) builds a github.com/.../issues/new URL with pre-filled title, body (with flashcard ID), and flashcard-feedback label
• All 3 flashcard views updated (study mode, grid, list) — origin badge wrapped in <a target="_blank"> with stopPropagation to avoid triggering card flip/selection

const buildFlashcardIssueUrl = (flashcardId: string) => {
  const params = new URLSearchParams({
    title: `[Flashcard] Feedback: ${flashcardId}`,
    body: `**Flashcard ID:** \`${flashcardId}\`\n\nDescribe tu feedback...\n\n`,
    labels: 'flashcard-feedback',
  });
  return `${REPO_ISSUES_URL}?${params.toString()}`;
};