fix: control plane UI fixes for recall and data view

[nicoloboschi]

Summary

• NaN score crash: Cross-encoder can return NaN scores which Pydantic serializes as JSON null, crashing the search debug view (score.toFixed(3) on null). Fixed by sanitizing NaN to 0.0 in the reranking pipeline and adding a null-coalesce in the UI.
• Data view filter UX: Text filter was firing a debounced ILIKE query on every keystroke — unusable for large banks (100k+ memories). Switched to search-on-Enter with a loading spinner in the search icon.
• Load more losing filters: "Load more" button didn't pass the active search/tag filters, resetting the view.

Test plan

• Recall a bank with trace enabled, verify scores are numeric (not null) in the debug view
• Open a large bank's data view, type a filter and press Enter — verify spinner shows and results filter correctly
• With an active filter, click "Load more" — verify filter is preserved