Scope selection/report localStorage by file fingerprint

[thinkingfish]

Summary

• Selection and report stores were persisted with fixed localStorage keys (rezolus_selection, rezolus_report), causing stale data to appear when switching between parquet files
• Add setStorageScope() to selection.js that re-keys localStorage by a content fingerprint (hash of filename + time range + metric count for site viewer, file checksum for binary viewer)
• Called after every file load (demo, file upload, binary bootstrap, binary upload)
• Each unique parquet file gets its own isolated selection/report state

Test plan

• Load demo.parquet, select a chart, reload — selection persists
• Switch to vllm.parquet — selection is clean (no stale charts)
• Switch back to demo.parquet — previous selection is restored
• Replace a demo file with different content but same name — old selection does not leak

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