[reilly1993]

Problem

Completed games on the Statistics page appeared in an unintuitive order because they were sorted by solve time rather than completion date.

Solution

• Sort each difficulty history from newest completion to oldest.
• Keep the score array from context immutable.
• Replace misleading podium/rank markers with a neutral calendar icon because the list is now chronological.
• Add coverage for mixed dates, same-day times and source-array immutability.

Verification

• Rebased onto the latest main.
• 187 Bun tests pass.
• TypeScript typecheck passes.
• Biome passes across src.
• Production Vite/PWA build and git diff --check pass.
• Manually verified in the local Statistics UI.

[JenspederM]

Should be a selector. I go for time when looking at stats ;)