fix(frontend): canvas-confettiの型定義を追加

[kakkokari-gtyih]

What

Why

なかったので

Additional info (optional)

Checklist

• [x] Read the contribution guide
• [ ] Test working in a local environment
• [ ] (If needed) Add story of storybook
• [ ] (If needed) Update CHANGELOG.md
• [ ] (If possible) Add tests

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 19.54%. Comparing base (ea2675e) to head (f9ee2ab). Report is 3 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #14692 +/- ## ============================================ - Coverage 39.67% 19.54% -20.13% ============================================ Files 1548 719 -829 Lines 194508 102082 -92426 Branches 2567 989 -1578 ============================================ - Hits 77172 19953 -57219 + Misses 116770 81581 -35189 + Partials 566 548 -18 ```

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[syuilo]

🙏🏻