Improve winner display after each round

[Hartwich]

Goal

Improve Schaetzorama winner/result display after individual rounds.

Codex Auftrag

Make round results understandable without external explanation.

Focus

• clearly show who won the round
• show the correct answer / target value
• show player guesses
• show score changes if available

Acceptance Criteria

• Round result is understandable without explanation.
• Winner and relevant values are readable on the host.
• Existing scoring logic remains correct.
• npm run typecheck passes.
• npm run build passes.

Safety

Do not add copyrighted, unclear, or unreviewed third-party assets or content.