Fix react-confetti props type import

[alucard210319]

Fixes #22.

Summary:

• Stop importing the removed named Props type from react-confetti.
• Derive the confetti options type from the Confetti component with React ComponentProps instead.
• Use ReactElement as the return/state element type.

Why:
The reported build fails at src/components/Confetti.tsx because react-confetti no longer exports a named Props type. Inferring the props from the imported component keeps this wrapper aligned with the installed package type definitions.

Verification:

• Inspected the reported Next.js build error and confirmed it points to the removed react-confetti Props import.
• Ran git diff --check.
• Not run locally: dependency installation could not complete because npm registry access failed from my environment while trying to install with a pnpm version compatible with this lockfile.

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