fix(heatmap): cache submission details in sessionStorage + fix prevSubmissionIdsRef bug#69

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NianJiuZst wants to merge 3 commits intopinchbench:mainfrom

NianJiuZst:fix/heatmap-cache

Commits on Apr 2, 2026

perf(task-heatmap): add submission-level caching + skip re-fetch when models unchanged
NianJiuZst
committed
fix(heatmap): add sessionStorage cache + fix prevSubmissionIdsRef bug
NianJiuZst
committed
fix(heatmap): remove redundant newCacheEntries + only persist when batch yields results
NianJiuZst
committed